My understanding of arctic and subarctic hunters and wildlife was enhanced by Make Prayers to the Raven, Hunters of the Northern Forest, and Hunters of the Northern Ice, by Richard K. Nelson; A Naturalist’s Guide to the Arctic, by E. C. Pielou; Interior & Northern Alaska: A Natural History, by Ronald L. Smith; and My Life with the Eskimo, by Vilhjalmur Stefansson.
My understanding of human evolution and migration was influenced by First Peoples in a New World, by David J. Meltzer; The Seven Daughters of Eve, by Bryan Sykes; Before the Dawn, by Nicholas Wade; and The Journey of Man, by Spencer Wells. A great source for information about the hunting methods and belief systems of aboriginal African hunters can be found in the works of Laurens van der Post, particularly The Lost World of the Kalahari and The Heart of the Hunter.
There are many great books about Daniel Boone, some of them outrageous and some of them thorough and grounded. I have read most of them, and the best and most contemporary examination of the man and the legend is Boone: A Biography, by Robert Morgan. Another great source of information about Boone and his era is the writing of historian Ted Franklin Belue, particularly The Hunters of Kentucky.
Good contemporary writing about the mountain men of the Rockies is woefully lacking, in my opinion. However, I have found some fascinating anecdotes and passages about these men in Jim Bridger, by J. Cecil Alter; Give Your Heart to the Hawks, by Win Blevins; The Mountain Men, by George Laycock; Journal of a Trapper, by Osborne Russell; and Tales of the Mountain Men, by Lamar Underwood.