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Lewin, B. D. (1932) Children who Run on all Fours and Other Animal-Like Behaviors in the Human Child.: By Ales Hrdlicka, M.D., Sc.D., D.Sc.Nat. Curator, Division of Physical Anthropology, U. S. National Museum, Smithsonian Institution. New York: Whittlesey House. 1931. 418 p.. Psychoanalytic Quarterly 1:366-368