Twentieth annual report, 1969-1972 :    annual review and reports of Subcommittees. 

 - Ottawa :    Information Canada,    1973. 
 - viii, 123 p. ;    24 cm. 
 - Geological Survey of Canada as GSC paper ;    72-6 .
<br/><br/><label>Subjects--Topical Terms: </label><br/> Geology -- Research -- Canada.
<br/><br/><label>Gov. Doc. Class. No.: </label>G. CAN E61 (08) 2/72-6