Author: Hosterman, John W.
Title: Underclay Deposits of Somerset and Eastern Fayette Counties, Pennsylvania; a Geological, Mineralogical, and Chemical Study of Underclay Beds in the Allegheny Formation of Southwestern Pennsylvania
Description: Washington, United States Government Printing Office, 1972. Softcover. Bottom edge of rear cover lightly bumped; otherwise very good condition. 17p. Two folding plates in rear pocket. (Geological Survey Bulletin 1363). .

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