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

 - New York  McGraw-Hill  1955. 
 - 316 p. 
 - McGraw-Hill series in education .
<br/><br/><label>LCCN: </label>54011759  
<br/><br/><label>Subjects--Topical Terms: </label><br/>School supervision, Secondary.