Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Ernst Haeckel
A. S. Packard
William Harvey
Francis M. Balfour
Charles W. Bodemer and Lester S. King
William A. Locy
Oscar Hertwig
A. M. Reese
W.B. Saunders Company
Gerald R. Leighton
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.