611.013 C280 v.18 Wilsen, Karl Miller, 1885- ... Correlation of external genitalia and sex- glands in the human embryo. By Karl M. Wilson... With two plates. (In Carnegie institution of Washington. Contributions to enbryology. Washington, 1926 29 x 23 cm. vol. XVIII, p. 23-30. 2 pl.) Contributions to embryology, no. 91 "References": p. 30