Butler, George D.  1893- <br/><br/>
Playgrounds :  their administration and operation / 
by George D. Butler 
 - 3d ed. 
 - New York :  Ronald Press Co.,  1960 
 - 513 p. :  illus. ;  21 cm. 
<br/><br/><label>LCCN: </label>60-013316 /L 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Playgrounds