Report of the international Geological correlation programme /  
UNESCO. 
 - Paris :  Unesco,  1981. 
 - 117 p. ;  27 cm. 
 - Geological correlation, no 9. .
<br/><br/>300  300 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology -- Research -- Periodicals.
<br/><br/><label>Dewey Class. No.: </label>550 / U3g