Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Wilhelm Bölsche
A. Cominelli
Various
P. Schuyler Miller
John Oxenham
Frank Lillie Pollock
Max Planck
Worthington Hooker
James Oppenheim
George O. Smith
Ellen M. Firebaugh
Alessandro Volta
Anton Pannekoek
Julian F. Grow
John Freke
William Hobbs
J. Harvey Haggard
Grace S. Richmond
Aletta H. Jacobs
Harlow Shapley and Cecilia Payne-Gaposchkin
Aaron A. Warford
John Smith
James Bonwick
Nellie Hellis
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.