Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Robert S. Ball
Galileo Galilei and Johannes Kepler
Camille Flammarion
Agnes M. Clerke
Mark Wicks
Charles Fort
Nostradamus
Alexander von Humboldt
David Brewster
Adam Smith
Parallax
E. W. Bullinger
Muḥammad ibn Aḥmad Bīrūnī
John Henry Pepper
James P. Boyd
Samuel Smiles
Sir Oliver Lodge
Thomas Hardy
Richard A. Proctor
Garrett Putman Serviss
Museum of History and Technology
Orison Swett Marden
George Forbes
J. Malcolm Bird
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.