Whenever this question gets asked I always respond that you will learn as much or more about hunting by reading books about hunters and hunting but that aren't how-to books (they have their place). A book like Stewart Edward White's The Long Rifle was as useful to me as Boyd's Blacktail Trophy Tactics (a good book).
That said, here is a list of books, not all strictly hunting related, that have taught me something about hunting:
A Sand County Almanac by Aldo Leopold
The Long Rifle by Stewart Edward White
Blacktail Trophy Tactics by Boyd Iverson
Trophy Blacktails by Scott Haugen
The Big Sky by A.B. Guthrie
Mountain Man by Vardis Fisher
The Complete Guide to Hunting, Butchering and Cooking Wild Game Volumes I & II by Steven Rinella
A Year in the Maine Woods by Bernd Heinrich
Indian Creek Chronicles by Pete Fromm
Elk of North America, Ecology and Management Jack Ward Thomas
just to name a few...
