----------------------------Original message---------------------------- 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