Ballard, William Whitney,  1906- <br/><br/>
Comparative anatomy and embryology / 
William W. Ballard 
 - New York :  Ronald Press Co,  1964 
 - 618 p. :  illus.;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Anatomy, Comparative<br/>Embryology.
<br/><br/><label>Subjects--Index Terms: </label>Giải phẫu Phôi học 
<br/><br/><label>Dewey Class. No.: </label>571.3  / BAL 1964