Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
J. W. H. Eyre
H. L. Russell
Thomas Henry Huxley
H. W. Conn
Charles Neil McBryde
H. L. Russell and E. G. Hastings
Edward J. Russell and Rothamsted Experimental Station
Frank H. Hall, Harry Alexis Harding, L. A. Rogers, and George A. Smith
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.