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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.
keyword: Science – 69 free books.
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Lectures on Popular and Scientific Subjects
James Sinclair Caithness, 14th earl of
The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
J. Arthur (John Arthur) Thomson
The World's Greatest Books — Volume 15 — Science
Arthur Mee and John Alexander Hammerton, Sir, editors
Lewis Einstein (editor) and da Vinci Leonardo (Author)
John W. (John Woodside) Ritchie (editor) and Carleton Washburne (Author)