Block, James H <br/><br/>
Mastery learning / 
by James H Block 
 - New York :  Holt,  1947. 
 - 152p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Learning
<br/><br/><label>Dewey Class. No.: </label>153.15  / BLO.M