diff --git a/init.lua b/init.lua
index 2c71d84..ae21a7a 100644
--- a/init.lua
+++ b/init.lua
@@ -1,17 +1,14 @@
 -- TODO:
--- local bulletin boards? May not care about this
--- forward/back buttons to page through the bulletins on a board
--- "Bulletin X/Y" indicator on bulletin page
--- Timeout/teardown option for old posts if there's no space left.
---		Sort posts by number of posts per player, then tear down the oldest post from that group.
---		eg, if a player has 8 posts and another player has 7, tear down the oldest of the first player,
---			then the oldest of their combined posts
--- Admin override to tear down and edit bulletins
--- Protection?
+-- There's potential race conditions in here if two players have the board open
+-- and a culling happens or they otherwise diddle around with it. For now just
+-- make sure it doesn't crash
 
 local S = minetest.get_translator(minetest.get_current_modname())
 
-local bulletin_max = 6*7
+local bulletin_max = 7*8
+
+local culling_interval = 86400 -- one day in seconds
+local culling_min = bulletin_max - 12 -- won't cull if there are this many or fewer bulletins
 
 local bulletin_boards = {}
 bulletin_boards.player_state = {}
@@ -26,7 +23,7 @@ else
 end
 
 local function save_boards()
-	file, e = io.open(path, "w");
+	local file, e = io.open(path, "w");
 	if not file then
 		return error(e);
 	end
@@ -38,16 +35,20 @@ local max_text_size = 5000 -- half a book
 local max_title_size = 60
 local short_title_size = 12
 
+-- gets the bulletins currently on a board
+-- and other persisted data
 local function get_board(name)
 	local board = bulletin_boards.global_boards[name]
 	if board then
 		return board
 	end
 	board = {}
+	board.last_culled = minetest.get_gametime()
 	bulletin_boards.global_boards[name] = board
 	return board
 end
 
+-- for incrementing through the bulletins on a board
 local function find_next(board, start_index)
 	local index = start_index + 1
 	while index ~= start_index do
@@ -75,6 +76,53 @@ local function find_prev(board, start_index)
 	return index
 end
 
+-- Groups bulletins by count-per-player, then picks the oldest bulletin from the group with the highest count.
+
+-- eg, if A has 1 bulletin, B has 2 bulletins, and C has 2 bulletins, then this will pick the oldest
+-- bulletin from (B and C)'s bulletins. Returns index and timestamp, or nil if there's nothing.
+local function find_most_cullable(board_name)
+	local board = get_board(board_name)
+	local player_count = {}
+	local max_count = 0
+	local total = 0
+	for i = 1, bulletin_max do
+		 local bulletin = board[i]
+		 if bulletin then
+			total = total + 1
+			local player_name = bulletin.owner
+			local count = (player_count[player_name] or 0) + 1
+			max_count = math.max(count, max_count)
+			player_count[player_name] = count		 
+		 end
+	end
+	
+	if total <= culling_min then
+		return
+	end
+	
+	local max_players = {}
+	for player_name, count in pairs(player_count) do
+		if count == max_count then
+			max_players[player_name] = true
+		end
+	end
+	
+	local most_cullable_index
+	local most_cullable_timestamp
+	for i = 1, bulletin_max do
+		local bulletin = board[i]
+		if bulletin and max_players[bulletin.owner] then
+			if bulletin.timestamp <= (most_cullable_timestamp or bulletin.timestamp) then
+				most_cullable_timestamp = bulletin.timestamp
+				most_cullable_index = i
+			end
+		end
+	end
+	
+	return most_cullable_index, most_cullable_timestamp
+end
+
+-- safe way to get the description string of an item, in case it's not registered
 local function get_item_desc(stack)
 	local stack_def = stack:get_definition()
 	if stack_def then
@@ -83,10 +131,25 @@ local function get_item_desc(stack)
 	return stack:get_name()
 end
 
+-- shows the base board to a player
 local function show_board(player_name, board_name)
 	local formspec = {}
 	local board = get_board(board_name)
 	local current_time = minetest.get_gametime()
+	
+	local intervals = (current_time - board.last_culled)/culling_interval
+	local cull_count, remaining_cull_time = math.modf(intervals)
+	while cull_count > 0 do
+		local cull_index = find_most_cullable(board_name)
+		if cull_index then
+			board[cull_index] = nil
+			cull_count = cull_count - 1
+		else
+			cull_count = 0
+		end
+	end
+	board.last_culled = current_time - math.floor(culling_interval * remaining_cull_time)
+	
 	local def = bulletin_boards.board_def[board_name]
 	local desc = def.desc
 	local tip
@@ -132,42 +195,34 @@ local function show_board(player_name, board_name)
 	minetest.show_formspec(player_name, "bulletin_boards:board", table.concat(formspec))
 end
 
-local icons = {
-	"bulletin_boards_document_comment_above.png",
-	"bulletin_boards_document_back.png",
-	"bulletin_boards_document_next.png",
-	"bulletin_boards_document_image.png",
-	"bulletin_boards_document_signature.png",
-	"bulletin_boards_to_do_list.png",
-	"bulletin_boards_documents_email.png",
-	"bulletin_boards_receipt_invoice.png",
-}
-
-
+-- shows a specific bulletin on a board
 local function show_bulletin(player, board_name, index)
 	local board = get_board(board_name)
 	local def = bulletin_boards.board_def[board_name]
+	local icons = def.icons
 	local bulletin = board[index] or {}
 	local player_name = player:get_player_name()
 	bulletin_boards.player_state[player_name] = {board=board_name, index=index}
 	
 	local tip
+	local has_cost
 	if def.cost then
 		local stack = ItemStack(def.cost)
+		local player_inventory = minetest.get_inventory({type="player", name=player_name})
 		tip = S("Post bulletin with this icon at the cost of @1 @2", stack:get_count(), get_item_desc(stack))
+		has_cost = player_inventory:contains_item("main", stack)
 	else
 		tip = S("Post bulletin with this icon")
+		has_cost = true
 	end
-
 	
-	local player_inventory = minetest.get_inventory({type="player", name=player_name})
-	local has_paper = player_inventory:contains_item("main", "default:paper")
+	local admin = minetest.check_player_privs(player, "server")
 	
 	local formspec = {"size[8,8]"
 		.."button[0.2,0;1,1;prev;"..S("Prev").."]"
 		.."button[6.65,0;1,1;next;"..S("Next").."]"}
 	local esc = minetest.formspec_escape
-	if (bulletin.owner == nil or bulletin.owner == player_name) and has_paper then
+	if ((bulletin.owner == nil or bulletin.owner == player_name) and has_cost) or admin then
 		formspec[#formspec+1] = 
 			"field[1.5,0.75;5.5,0;title;"..S("Title:")..";"..esc(bulletin.title or "").."]"
 			.."textarea[0.5,1.15;7.5,7;text;"..S("Contents:")..";"..esc(bulletin.text or "").."]"
@@ -181,12 +236,17 @@ local function show_bulletin(player, board_name, index)
 			.."label["..(#icons+1)*0.75-0.25 ..",7;"..S("Delete:").."]"
 	elseif bulletin.owner then
 		formspec[#formspec+1] = 
-			"label[1.4,0.5;"..S("by @1", bulletin.owner).."]"
+			"label[1.4,0.5;"..S("Posted by @1", bulletin.owner).."]"
 			.."tablecolumns[color;text]"
 			.."tableoptions[background=#00000000;highlight=#00000000;border=false]"
-			.."table[1.4,0.25;5,0.5;title;#FFFF00,"..esc(bulletin.title or "").."]"
+			.."table[1.35,0.25;5,0.5;title;#FFFF00,"..esc(bulletin.title or "").."]"
 			.."textarea[0.5,1.5;7.5,7;;"..esc(bulletin.text or "")..";]"
 			.."button[2.5,7.5;3,1;back;" .. S("Back to Board") .. "]"
+		if bulletin.owner == player_name then
+			formspec[#formspec+1] = "image_button[".. (#icons+1)*0.75-0.25 ..",7.35;1,1;bulletin_boards_delete.png;delete;]"
+				.."tooltip[delete;"..S("Delete this bulletin").."]"
+				.."label["..(#icons+1)*0.75-0.25 ..",7;"..S("Delete:").."]"
+		end
 	else
 		return
 	end
@@ -194,7 +254,7 @@ local function show_bulletin(player, board_name, index)
 	minetest.show_formspec(player_name, "bulletin_boards:bulletin", table.concat(formspec))
 end
 
-
+-- interpret clicks on the base board
 minetest.register_on_player_receive_fields(function(player, formname, fields)
 	if formname ~= "bulletin_boards:board" then return end
 	local player_name = player:get_player_name()
@@ -210,14 +270,17 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 	end	
 end)
 
+-- interpret clicks on the bulletin
 minetest.register_on_player_receive_fields(function(player, formname, fields)
 	if formname ~= "bulletin_boards:bulletin" then return end
 	local player_name = player:get_player_name()
 	local state = bulletin_boards.player_state[player_name]
 	if not state then return end	
 	local board = get_board(state.board)
+	local def = bulletin_boards.board_def[state.board]
 	if not board then return end
 	
+	-- no security needed on these actions
 	if fields.back then
 		bulletin_boards.player_state[player_name] = nil
 		show_board(player_name, state.board)
@@ -233,6 +296,18 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		show_bulletin(player, state.board, next_index)
 		return
 	end
+
+	if fields.quit then
+		minetest.after(0.1, show_board, player_name, state.board)
+	end
+
+	-- check if the player's allowed to do the stuff after this
+	local admin = minetest.check_player_privs(player, "server")
+	local current_bulletin = board[state.index]
+	if not admin and (current_bulletin and current_bulletin.owner ~= player_name) then
+		-- someone's done something funny. Don't be accusatory, though - could be a race condition
+		return
+	end
 	
 	if fields.delete then
 		board[state.index] = nil
@@ -241,9 +316,12 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 	end
 	
 	local player_inventory = minetest.get_inventory({type="player", name=player_name})
-	local has_paper = player_inventory:contains_item("main", "default:paper")
+	local has_cost = true
+	if def.cost then
+		has_cost = player_inventory:contains_item("main", def.cost)
+	end
 	
-	if fields.text ~= "" and has_paper then
+	if fields.text ~= "" and (has_cost or admin) then
 		for field, _ in pairs(fields) do
 			if field:sub(1, #"save_") == "save_" then
 				local i = tonumber(field:sub(#"save_"+1))
@@ -251,26 +329,39 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 				bulletin.owner = player_name
 				bulletin.title = fields.title:sub(1, max_title_size)
 				bulletin.text = fields.text:sub(1, max_text_size)
-				bulletin.icon = icons[i]
+				bulletin.icon = def.icons[i]
 				bulletin.timestamp = minetest.get_gametime()
 				board[state.index] = bulletin
-				player_inventory:remove_item("main", "default:paper")
+				if not admin and def.cost then
+					player_inventory:remove_item("main", def.cost)
+				end
 				save_boards()
 				break
 			end
 		end
 	end
-	
-	if fields.quit then
-		minetest.after(0.1, show_board, player_name, state.board)
-	end
-	
+
 	bulletin_boards.player_state[player_name] = nil
 	show_board(player_name, state.board)
 end)
 
+-- default icon set
+local base_icons = {
+	"bulletin_boards_document_comment_above.png",
+	"bulletin_boards_document_back.png",
+	"bulletin_boards_document_next.png",
+	"bulletin_boards_document_image.png",
+	"bulletin_boards_document_signature.png",
+	"bulletin_boards_to_do_list.png",
+	"bulletin_boards_documents_email.png",
+	"bulletin_boards_receipt_invoice.png",
+}
 
-local function generate_random_board(rez, count)
+-- generates a random jumble of icons to superimpose on a bulletin board texture
+-- rez is the "working" canvas size. 32-pixel icons get scattered on that canvas
+-- before it is scaled down to 16 pixels
+local function generate_random_board(rez, count, icons)
+	icons = icons or base_icons
 	local tex = {"([combine:"..rez.."x"..rez}
 	for i = 1, count do
 		tex[#tex+1] = ":"..math.random(1,rez-32)..","..math.random(1,rez-32)
@@ -282,7 +373,9 @@ end
 
 local function register_board(board_name, board_def)
 	bulletin_boards.board_def[board_name] = board_def
-	local tile = "bulletin_boards_corkboard.png^"..generate_random_board(98, 7).."^bulletin_boards_frame.png"
+	local background = board_def.background or "bulletin_boards_corkboard.png"
+	local foreground = board_def.foreground or "bulletin_boards_frame.png"
+	local tile = background.."^"..generate_random_board(98, 7, board_def.icons).."^"..foreground
 	local bulletin_board_def = {
 		description = board_def.desc,
 		groups = {choppy=1},
@@ -310,9 +403,18 @@ local function register_board(board_name, board_def)
 		end,
 	}
 
-	minetest.register_node("bulletin_boards:bulletin_board_"..board_name, bulletin_board_def)
+	minetest.register_node(board_name, bulletin_board_def)
 end
 
-register_board("test1", {desc = S("Test Board 1"), cost = "default:paper"})
-register_board("test2", {desc = S("Test Board 2"), cost = "default:paper"})
-register_board("test3", {desc = S("Test Board 3"), cost = "default:paper"})
\ No newline at end of file
+register_board("bulletin_boards:bulletin_board_basic", {
+	desc = S("Public Bulletin Board"),
+	cost = "default:paper",
+	icons = base_icons,
+})
+
+register_board("bulletin_boards:bulletin_board_copper", {
+	desc = S("Copper Board"),
+	cost = "default:copper_ingot",
+	foreground = "bulletin_boards_frame_copper.png",
+	icons = base_icons,
+})
diff --git a/locale/template.pot b/locale/template.pot
new file mode 100644
index 0000000..e2d0d6d
--- /dev/null
+++ b/locale/template.pot
@@ -0,0 +1,87 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2020-01-21 19:38-0700\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=CHARSET\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: init.lua:158
+msgid "Post your bulletin here for the cost of @1 @2"
+msgstr ""
+
+#: init.lua:160
+msgid "Post your bulletin here"
+msgstr ""
+
+#: init.lua:186
+msgid ""
+"@1\n"
+"Posted by @2\n"
+"@3 days ago"
+msgstr ""
+
+#: init.lua:212
+msgid "Post bulletin with this icon at the cost of @1 @2"
+msgstr ""
+
+#: init.lua:215
+msgid "Post bulletin with this icon"
+msgstr ""
+
+#: init.lua:222
+msgid "Prev"
+msgstr ""
+
+#: init.lua:223
+msgid "Next"
+msgstr ""
+
+#: init.lua:227
+msgid "Title:"
+msgstr ""
+
+#: init.lua:228
+msgid "Contents:"
+msgstr ""
+
+#: init.lua:229
+msgid "Post:"
+msgstr ""
+
+#: init.lua:235
+#: init.lua:247
+msgid "Delete this bulletin"
+msgstr ""
+
+#: init.lua:236
+#: init.lua:248
+msgid "Delete:"
+msgstr ""
+
+#: init.lua:239
+msgid "Posted by @1"
+msgstr ""
+
+#: init.lua:244
+msgid "Back to Board"
+msgstr ""
+
+#: init.lua:410
+msgid "Public Bulletin Board"
+msgstr ""
+
+#: init.lua:416
+msgid "Copper Board"
+msgstr ""
diff --git a/locale/update.bat b/locale/update.bat
new file mode 100644
index 0000000..e87d44c
--- /dev/null
+++ b/locale/update.bat
@@ -0,0 +1,6 @@
+@echo off
+setlocal ENABLEEXTENSIONS ENABLEDELAYEDEXPANSION
+cd ..
+set LIST=
+for /r %%X in (*.lua) do set LIST=!LIST! %%X
+..\intllib\tools\xgettext.bat %LIST%
\ No newline at end of file
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..8a8dc5e
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,13 @@
+## Bulletin boards
+
+This mod adds global bulletin boards to Minetest. These are boards where players can post short notes for other players to see, at a nominal cost.
+
+| ![](screenshot.png) | ![](screenshot_bulletin.png) |
+
+Each board can hold up to 56 bulletins (in an 8 by 7 grid), with each bulletin having a title and an icon that can be set by the player posting it. Once the bulletin board nears capacity, older bulletins will start being culled from the board to make room for new bulletins. They will be culled by preference starting with the bulletins belonging to the players who have the most bulletins currently posted, followed by the oldest bulletin belonging to those players.
+
+So for example, if Alice has 1 bulletin on the board, Bob has 2 bulletins on the board, and Collin has 2 bulletins on the board, then when it comes time to cull a bulletin the oldest one belonging to either Bob or Collin will be culled. If that happens to be Bob's, then next time it's time to cull Alice will have 1, Bob will have 1, and Collin will have 2, so the oldest of Collin's bulletins will be culled. This ordering is done to try to balance things out fairly - players that hog the board with multiple bulletins will have their bulletins culled more often, but everyone's single most recent bulletin will stick around as long as possible.
+
+Bulletin boards can have a cost associated with posting. If the player has the cost (an item stack) in their inventory, they can post and the cost will be automatically deducted.
+
+Boards are "global", in the sense that all instances of a given type of board will have the same content regardless of where they are in the world. This can make them useful as a means of communication over distance as well as time, serving as a sort of public post office.
\ No newline at end of file
diff --git a/screenshot.png b/screenshot.png
new file mode 100644
index 0000000..cec7de4
Binary files /dev/null and b/screenshot.png differ
diff --git a/screenshot_bulletin.png b/screenshot_bulletin.png
new file mode 100644
index 0000000..59c9c95
Binary files /dev/null and b/screenshot_bulletin.png differ
diff --git a/textures/bulletin_boards_frame_copper.png b/textures/bulletin_boards_frame_copper.png
new file mode 100644
index 0000000..ebf4162
Binary files /dev/null and b/textures/bulletin_boards_frame_copper.png differ
diff --git a/textures/license.txt b/textures/license.txt
index 94a3e1f..3be9326 100644
--- a/textures/license.txt
+++ b/textures/license.txt
@@ -1,2 +1,17 @@
-https://commons.wikimedia.org/wiki/Category:Document_icons
-https://commons.wikimedia.org/wiki/File:Symbol_delete_vote_darkened.svg
\ No newline at end of file
+bulletin_boards_corkboard.png and bulletin_boards_frame.png - by FaceDeer, released under the CC-0 public domain license
+
+bulletin_boards_delete.png - from https://commons.wikimedia.org/wiki/File:Symbol_delete_vote_darkened.svg under the public domain
+
+The following are from the "Farm-Fresh Web Icons" set, May 5 2014, from http://www.fatcow.com/free-icons by FatCow under the CC-BY-SA 3.0 unported license:
+bulletin_boards_document_back.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_document_back.png
+bulletin_boards_document_comment_above.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_document_comment_above.png
+bulletin_boards_document_image.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_document_image.png
+bulletin_boards_document_next.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_document_next.png
+bulletin_boards_document_notes.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_document_notes.png
+bulletin_boards_document_quote.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_document_quote.png
+bulletin_boards_document_signature.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_document_signature.png
+bulletin_boards_documents_email.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_documents_email.png
+bulletin_boards_receipt_invoice.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_receipt_invoice.png
+bulletin_boards_to_do_list.png - https://commons.wikimedia.org/wiki/File:Farm-Fresh_to_do_list.png
+
+The Farm-Fresh Web Icons were found via found from https://commons.wikimedia.org/wiki/Category:Document_icons if you want more of them