Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Anton Pavlovich Chekhov
H. L. Mencken
Louis Pasteur
Various
Edwin LeFevre
H. R. Procter
Bertha May Clark
Arthur Harden
Sir Arthur Newsholme
Loudon M. Douglas
A. Cooper
H. L. Russell and E. G. Hastings
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.