Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Galileo Galilei and Johannes Kepler
Agnes M. Clerke
Charles Fort
Robert S. Ball
Camille Flammarion
Alexander von Humboldt
E. W. Bullinger
Parallax
Muḥammad ibn Aḥmad Bīrūnī
James P. Boyd
John Henry Pepper
David Brewster
Thomas Nathaniel Orchard
Garrett Putman Serviss
Orison Swett Marden
Sir Oliver Lodge
J. Malcolm Bird
Richard Adams Locke
George Forbes
Richard A. Proctor
William Tyler Olcott
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E. Walter Maunder
George F. Chambers
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.