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Roland B. Dixon, Racial History of Man (1923).
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Frederick E. Zeuner, Dating the Past, 4th edit. (1958).
Robert H. Lowie, The History of Ethnological Theory (1937).
Marcellin Boule and Henri V. Vallois, Fossil Men, trans. by Michael Bullock (1957).
Robert J. Braidwood, Prehistoric Men, 4th edit. (1959).
K. M.