McKay, Herbert.  <br/><br/>
Half-hours with geology / 
Herbert McKay. 
 - London :  Oxford Univ. Pre.,  c 1960. 
 - vi, 140 p. ;  ill. ;  19 cm. 
 - New playbooks of science.  .
<br/><br/>345  345 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology.
<br/><br/><label>Dewey Class. No.: </label>550 / M192h