Digital Unlimited The Variation of Animals and Plants Under Domestication, Vol. I. Charles Darwin General
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Digital Unlimited New and Original Theories of the Great Physical Forces Henry Raymond Rogers General
Digital Unlimited The Cost of Living Among Wage-Earners: Fall River, Massachusetts, October, 1919, Research Report Number 22, November, 1919 National Industrial Conference Board General
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Digital Unlimited Darwin, and After Darwin, Volumes 1 and 3: An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions George John Romanes General
