This is an old book (1961). Therefore, don’t go into it expecting it to read like the more upbeat modern history tomes. But Don Berry did a great job of researching it and documenting the facts of the early mountain men and explorers on the western frontier. The book is written in proper time sequence, so you are able to follow the events leading up to Hugh Glass’s ordeal, currently rewritten in The Revenant and made into a film. You will note that Don Berry doesn’t take as much author license with the facts, including what actually happened following that incident. The begin of the demise of the fur trading industry is documented at the end of the book, of course, those who were flexible moved on, and those who didn’t … I enjoyed the book and will use some references for later writing ideas when I get onto the the writing of my western series.