Preston, Ralph C. <br/><br/>
Teaching social studies in the elementary schools /  
Ralph C. Preston 
 - New York :  Holt, Rinehart & Winston,   1958 
 - xviii, 382 p 
<br/><br/>Incluye bibliografía e índice 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciencias sociales--Enseñanza elemental
<br/><br/><label>Dewey Class. No.: </label>372.83 P939t