Selsam, Millicent Ellis, 1912-  1912- <br/><br/>
How animals sleep;  a time for sleep /  [book] 

 - New York,  Scholastic Book Services  1962 
 - 63 p.  illus.  21 cm. 
<br/><br/><label>Dewey Class. No.: </label>591.51 SEL