http://boards.historychannel.com/index.jspa?categoryID=1 (http://boards.historychannel.com/index.jspa?categoryID=1)
http://boards.historychannel.com/category.jspa?categoryID=700000023 (http://boards.historychannel.com/category.jspa?categoryID=700000023)
Historum (http://www.historum.com/)