OGL Core Rules
If you want to reference an Open Gaming License version of the Core Rules, here it is. Use this if the OGL is your preferred method of making official that you have permission to modify, copy, and redistribute this game-machanic content. Spread the word!
Hero & Wizard Specs
In case you use the "Special Combat" optional rule (1:1 battles between opposing heroes), here's RPG-scale specifications for the high-level Knights, Barbarians, and Wizards that appear in the game. Now they can fight up-close personal! Also includes historical source notes, and the OGL license.
For signaling which units have failed a morale check, and must flee off the table. Never give your opponent a free unit! (Recommended usage: Print on cover cardstock and cut along the indicated lines.)
Tiles for each of the terrain types found in the Book of War game (pond, stream, marsh, woods, hill, rough, and gulley). Seven photorealistic images, each a standard page in size, depicted at BOW scale (1"=20 feet), in a ZIP archive. Print several copies out on paper or cardstock and never be at a loss for the proper terrain revealed in-game.