You guys seriously need to read these instead of rehashes of FM21-76 and Kochanski's Bushkek over and over.
Especially the thousand page long one by Kephart.>>1081391
A Field Guide to Mammal Tracking in North America - James C. Halfpenny.
May not be what you're looking, but this is the best book on tracking I've come across.
After having flipped through many others on the subject, this is the one I bought.