The typical trapper was a young man—strong hardy and adventure loving. Having succumbed to the lure of the wilderness, his thin veneer of civilization soon rubbed off. In the wilds he had little need for money—barter supplied his simple wants. Possibly short on book-learning, he could read moccasin tracks, beaver sign, and trace of the travois.

Memorials to them cover the West. Mountain peaks, passes, rivers and lakes carry their names. Towns and counties have been christened in their honor. Their trails have become our highways—their campfire ashes, our cities.

The fourth volume comprises 397 pages, and contains 31 biographical sketches, 15 illustrations. Included in Volume IV are the biographies of George Bent; Robert Bent; George Drouillard; Moses "Black" Harris; James Ohio Pattie; Joshua Pilcher, Antoine Robidoux; John Rowland; Peter Sarpy; Thomas L. (Peg-leg) Smith.