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1. Greater Pittsburgh region structure contour map of Allegheny, Armstrong, Beaver, Butler, Washington, and Westmoreland Counties /

Pennsylvania. Bureau of Topographic and Geologic Survey. U.S. Geological Survey ;.

2. Stratigraphy and structure of the subsurface Cambrian and Ordovician carbonates of New York

Rickard, Lawrence V. University of the State of New York, State Education Dept.,.

3. Subsurface structure of plateau region north-central and western Pennsylvania on top of Oriskany Formation /

Cate, Addison S. Pennsylvania Geological Survey,.

4. Subsurface Tully Limestone, New York and northern Pennsylvania

Wright, Nancy A. University of the State of New York, State Education Dept.,.

5. Surface structure map of parts of Lycoming, Clinton, Tioga, and Potter Counties, Pennsylvania

Colton, George Willis, 1920-. Topographic and Geologic Survey, Commonwealth of Pa., Dept. of Internal Affairs,.