Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Sir E. A. Wallis Budge
George Smith
L. W. King
Svante Arrhenius
James Jeans
Isaac W. Heysinger
James Croll
Lewis Richard Farnell
Percival Lowell
Agnes M. Clerke
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.