Many of National Geographic's Top 100 Greatest Adventure Books of All Time are freely available online. The list of 100 books by National Geographic is probably the best of its type. If a canon of Outdoor/Adventure/Exploration literature could reasonably be made, this might be it (from an American perspective). The selection process was rigerous and the books are mostly primary source first-person. Many of the books are in the public domain and freely available online in first edition scans. The scans contain everything that made the book famous - often lacking in later reprints - such as pictures, maps and drawings. Below are those books from the list that are freely available for download. Enjoy them as they were originally meant to be.

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