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All these books are free to read: either they're distributed with a free license, or they're in the public domain.
These books are included in Project Gutenberg. They are archived and can be improved at GITenberg.
The music of the spheres : A nature lover's astronomy
Florence Armstrong Grondal
Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1
Alexander von Humboldt
Richard A. (Richard Anthony) Proctor
Astronomy of To-day: A Popular Introduction in Non-Technical Language
Cecil Goodrich Julius Dolmage
The Beauties of Nature, and the Wonders of the World We Live In
John Lubbock, Sir