Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Sir Richard Francis Burton
H. G. Wells
Paul B. Du Chaillu
A. W. Greely
Carl Ethan Akeley
R. M. Ballantyne
R. L. Garner
Richard A. Proctor
Thomas Burke
Richard Grant White
Various
Konni Zilliacus
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.