Description
Published:No. 2-
Physical Description:volumes ; 22-28 cm.
ISSN:0090-6727
Action Note:committed to retain
Issuing Body Note:Vols. for 1944- issued by the University of Nebraska, Lincoln, Conservation and Survey Division; 19<76>- by the University of Nebraska--Lincoln, Conservation and Survey Division.
Some vols. prepared in cooperation with the U.S. Geological Survey.