Orr, Robert Thomas,  1908- <br/><br/>
The little-known pika / 
by Robert T. Orr. 
 - New York :  Macmillan,  c1977. 
 - xiii, 144 p. :  ill. ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 135-137. 
<br/><br/><label>ISBN: </label>0025939602 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pikas.
<br/><br/><label>LC Class. No.: </label>QL737.L33  / O77 
<br/><br/><label>Dewey Class. No.: </label>599/.322