Title: Greater Pittsburgh region: Structure contour map : of Allegheny, Armstrong, Beaver, Butler, Washington, and Westmoreland Counties /
Authors: Wagner, Walter Richard, 1928-1974.; Heyman, Louis.; Craft, Jesse L.; Edmunds, William E.; Harper, John A.; Pennsylvania.; Geological Survey (U.S.); Williams and Heintz Map Corporation
Publisher: Published by the U.S. Geological Survey,
Year: 1975
Subjects: Geology, Structural Pennsylvania Pittsburgh Region Maps.; Geology Pennsylvania Pittsburgh Region Maps.; Pittsburgh Region Maps.