A big part of bigfooting is trying to find and identify signs of their passing. There is no substitute for experience in the woods, but there are some excellent books to help you figure out what you are looking at. Below are some of my favorites.
Mammal Tracks & Sign: A Guide to North American Species
by Mark Elbroch
This is, by far, the best book I have yet run across on the subject of tracks and sign of mammals for here in North America. With chapters detailing subjects such as burrows, bedding sites, footprints, scat, wallows, runs, and more, this book covers the gamut of likely sign left by most critters. While sasquatches are no included in the book, just about every other species is, from mice and moles all the way to the other side of the spectrum with brown bears and polar bears. The book is not just detailed in its writing, either. There are beautiful full-color photographs to illustrate much of what the author details in his straight-forward and concise writing style. This book is a really great addition to any outdoor enthusiast’s library.