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
Alexander von Humboldt
Parallax
E. W. Bullinger
Muḥammad ibn Aḥmad Bīrūnī
James P. Boyd
John Henry Pepper
David Brewster
Sir Oliver Lodge
Garrett Putman Serviss
Richard A. Proctor
Thomas Nathaniel Orchard
Orison Swett Marden
George Forbes
J. Malcolm Bird
Richard Adams Locke
William Tyler Olcott
E. Walter Maunder
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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.