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I have been told that the old USGS Geologic Atlases/folios are valuable?
These are the large 22" X 18" softbound quadrangle maps with text. Does
anyone know if that is true? KS
 
Kathy Spencer                           [log in to unmask]
Geology Library                         Office: 701/777/2408
University of North Dakota              Fax: 701/777/4449
P.O. Box 8358
Grand Forks, ND 58202-8358