Hammock Robert C <br/><br/>
Supervising instruction in secondary schools 

 - New York, USA  McGraw-Hill Book Company  1955 
 - xv,316p. 
 - McGraw-Hill in Education .
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>School Administration