"The Green Hills of Africa" by Ernest Hemingway
There are two Ernest Hemingway's that we know best: Hemingway the novelist who wrote classics like For Whom the Bell Tolls, and Hemingway the larger-than-life outdoorsman. Although For Whom the Bell Tolls, a book on many high school reading lists to this day, was published a few years before it, 1933's Green Hills of Africa is the book that truly made Papa the adventurer we still talk about to this day.
Recounting his experiences in East Africa, Hemingway writes about hunting with the touch of a novelist, but also finds time to wax philosophical about 19th century European writers at certain points. It might not be considered among his greatest works, but it's an essential one to read if you want to know him. [$9, amazon.com]