File talk:Stage 11 historic-Davis1923-1.jpg
From Embryology
Description of a human embryo having twenty paired somites by Carl L. Davis, Washington, D.C. : Carnegie Institution of Washington, 1923. 51 p., 4 leaves of plates : ill. (some col.) ; 29 cm. Series Contributions to embryology ; v. 15, no. 72. Carnegie Institution of Washington publication ; 332.
