Stevens Coon Carleton. (1939). "Chapter VIII. Introduction to the Study of the Living". The Races Of Europe. Osmania University, Digital Library Of India. Macmillan. p. 291.
Orton, Sir Ernest Frederick (1935). Links with Past Ages. W. Heffer & Sons, Limited. p. 122.
darwin-online.org.uk
"It may be doubted whether any character can be named which is distinctive of a race and is constant... they graduate into each other, and.. it is hardly possible to discover clear distinctive characters between them... As it is improbable that the numerous and unimportant points of resemblance between the several races of man in bodily structure and mental faculties (I do not here refer to similar customs) should all have been independently acquired, they must have been inherited from progenitors who had these same characters.", Charles Darwin, The Descent of Man p. 225 onwards
doi.org
Templeton, A. (2016). "Evolution and Notions of Human Race". In Losos, J.; Lenski, R. (eds.). How Evolution Shapes Our Lives: Essays on Biology and Society. Princeton; Oxford: Princeton University Press. pp. 346–361. doi:10.2307/j.ctv7h0s6j.26. ... the answer to the question whether races exist in humans is clear and unambiguous: no.
"Indeed, if a species has sufficient gene flow, there can be no evolutionary tree of populations, because there are no population splits...", Templeton, A. (2016). Evolutions and Notions of Human Race. In Losos J. & Lenski R. (Eds.), How Evolution Shapes Our Lives: Essays on Biology and Society (p. 355). Princeton; Oxford: Princeton University Press. doi:10.2307/j.ctv7h0s6j.26.
The Racial Elements of European History by Hans F.K. Günther. Chapter IX Part Three: The Denordization of the Peoples of Romance Speech: "The French Revolution was a very thorough denordization of France. At that time it was often enough to be blond to be dragged to the scaffold. The French Revolution must be read as an Alpine-Mediterranean rising against a noble and burgher upper class of Nordic race. The Alpine race has spread very fast, one might say astoundingly fast, in France in the nineteenth century."
worldcat.org
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Breiting, Richard (1971). Calic, Édouard (ed.). Secret Conversations with Hitler : The Two Newly-Discovered 1931 Interviews. New York: John Day Co. p. 77. OCLC906949733.