Hirsch, Nathaniel D. Mttron  1896-1984 <br/><br/>
Twins :  heredity and environment / 
by Nathaniel D. Mttron Hirsch 
 - Cambridge :  Harvard University Press,  1930 
 - 149 p. :  ill.;  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Twins<br/>Heredity<br/>Human beings--Effect of environment on