Twins ; heredity and environment /

Bibliographic Details
Main Author:	Hirsch, Nathaniel David Mttron, 1896-
Format:	Book
Language:	English
Published:	Cambridge : Harvard university press, 1930.
Subjects:	Twins. Heredity. Human beings > Effect of environment on.

Description
Physical Description:	158 pages : frontispiece, illustrations ; 22 cm.
Bibliography:	Bibliographical foot-notes.