Petersen, William Earl,  1892- <br/><br/>
Dairy science,  its principles and practice. 
Edited by R. W. Gregory. 
 - 2d ed. 
 - Philadelphia,  Lippincott  [1950] 
 - viii, 695 p.  illus., maps.  24 cm. 
<br/><br/> "Reference readings": p. 676-686. 
<br/><br/><label>LCCN: </label>agr50000416  
<br/><br/><label>Nat. Bib. No.: </label>GB50-2689 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Dairying.<br/>Dairy cattle.
<br/><br/><label>LC Class. No.: </label>SF239  / .P43 1950 
<br/><br/><label>Dewey Class. No.: </label>637