Nichols, James Edward,  1902- <br/><br/>
Livestock improvement in relation to heredity and environment / 
by J.E. Nichols. 
 - 4th ed. 
 - Ames :  Iowa State College Press,  c1957. 
 - xi, 240 p. :  ill., plates, diagrs. (1 col.) ;  23 cm. 
<br/><br/>"References": p. 219-233. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heredity.<br/>Livestock.