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VIII - Principles of Sexual Selection Part 4

In The Descent of Man and Selection in Relation to Sex, Part 2

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Charles Darwin

Part 2 of 3 of a book on evolutionary theory by English naturalist Charles Darwin, first published in 1871. It was Darwin's second great boo…

Star Charts and Catalogues

In Astronomy: The Science of the Heavenly Bodies

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David Todd

The progress of astronomy from age to age has been far from uniform—rather by leaps and bounds: from the earliest epoch when man's planet ea…

Non-Euclidean Geometry, Some Simple Examples

In Easy Lessons in Einstein

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Edwin E. Slosson

Published in 1920, Slosson’s Easy Lessons in Einstein is one of the first popularizations of Einstein’s theory of relativity. This book is m…

Grecian Painting: Lesson 1

In The Artist

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B. F. Gandee

The Artist, or Young Ladies' Instructor in Ornamental Painting, Drawing etc. is a delightful art instruction book from 1835. Follow Charlott…

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