Hall, William Curtis. <br/><br/>
Searching into chemistry :  questions for secondary schools / 
William C. Hall. 
 - Edinburgh :  Oliver & Boyd,  1970. 
 - 111 p. :  ill. ;  20 cm. 
<br/><br/><label>ISBN: </label>2050022326 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry--Problems, exercises, etc.