Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Henry Mayhew
William Booth
L. G. Chiozza Money
Frank Andrew Munsey
Walter A. Wyckoff
S. A. Barnett and Mrs. S. A. Barnett
Edwin A. Brown
Alfred Russel Wallace
Various
Basil Thomson
William Harbutt Dawson
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.