Blough, Glenn Orlando. <br/><br/>
Elementary school science and how to teach it / 
Glenn Orlando Blough and Albert J. Huggett. 
 - New York :  The dryden press,  c 1954. 
 - 532 p. :  ill. ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography : p. 503-522. 
<br/><br/>340  340 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Education--Science.--Teaching
<br/><br/><label>Dewey Class. No.: </label>507 / B62e