Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Arthur Conan Doyle
Jules Verne
Kurt Matull, Felix Hageman, and Theo von Blankensee
Kurt Matull and Theo von Blankensee
Kees Valkenstein
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.