Nelsen, Olin Everett,  1898- <br/><br/>
Comparative embryology of the vertebrates / 
by Olin E. Nelsen 
 - New York :  McGraw-Hill Book,  1953 
 - xxiii, 982 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographies 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Embryology--Vertebrates