Geology of the conterminous United States at 1:2 500 000 scale : a digital representation of the 1974 P.B. King and H.M. Beikman map / by Paul G. Schruben [and others]
Series: U.S. Geological Survey.  Digital Data series 11
Publisher: Dept. of the Interior
Place of publication: Washington
Language: eng
Subjects: Geology - United states
Notes: 11