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From Embryology
Yerkes RM. and Elder JH. Concerning reproduction in the chimpanzee. (1937) Yale J Biol. Med. 10(1): 41–48. PMC2601810
Yerkes RM. and Elder JH. Concerning reproduction in the chimpanzee. (1937) Yale J Biol. Med. 10(1): 41–48. PMC2601810