Secondary sex characters of Chinese frogs and toads.

v.22:no.2(1936)

Courtship and mating behavior in snakes, by D. Dwight Davis.

v.20:no.22(1936)

Copulatory adjustment in snakes, by Clifford H. Pope.

v.24:no.22(1941)

Secondary sexual characters and ecological competition.

v.34:no.6(1952)

The descent of man, and selection in relation to sex. By Charles Darwin.

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