King, Frederick M. <br/><br/>
What is gravity / 
Fred M. King and George R. Otto ;  Pictures by William Tanis. 
 - Chicago :  Benefic Press,  1960. 
 - 43 p. :  ill. ;  21 cm. 
 - The What is it series. .
<br/><br/>300  300 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gravity.
<br/><br/><label>Dewey Class. No.: </label>531.5 / K581w