Merrill, Richard J. <br/><br/>
The CHEM study story / 
Ricahrd J. Merrill, David W. Ridgway. 
 - San Francisco :  W.H. Freeman,  c1969. 
 - vii, 162 p. : ill. 
<br/><br/><label>LCCN: </label>68-9537 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry--Study and teaching (Secondary)--United States.<br/>The Chemical Education Material Study (CHEM).