Hammock, Robert C.,    1908- <br/><br/>
Supervising instruction in secondary schools /  
by Robert C. Hammo ck and Ralph S. Owings. 
 - New York :    McGraw-Hill,    1955. 
 - 316 p. ;    24 cm. 
 - McGraw-Hill series in education. .
<br/><br/><label>Subjects--Topical Terms: </label><br/> School supervision, Secondary.
<br/><br/><label>Dewey Class. No.: </label>373.11