Deadfalls and Snares is a book written and published by A.R. Harding in the early 1900s. It focuses on different trapping techniques using, you guessed it, deadfalls and snares. The author goes through different traps, designed for specific types of animals, and the best ways to both use the traps, and the best time to use them.
I find that the pictures do not give a good enough view of how each trap works. The text however is well written, and goes a long way to remedy that ambiguity. This is the type of text that is hard to find these days, but the material covered can be very valuable to the outdoorsman.
As fart as I know the book is in the public domain and can be downloaded here, here, and a number of other places online.