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