At head of title: Pennsylvania geological survey, fourth series.
Binding notes
One ANNEX copy with: Subsurface Trenton and sub-Trenton rocks in Ohio, New York, Pennsylvania and West Virginia / Charles Reinhard Fettke. [Harrisburg] : Topographic and Geologic Survey, 1948 -- Trenton and sub-Trenton of outcrop areas in New York, Pennsylvania and Maryland / Frank McKim Swartz. [Harrisburg] : Topographic and Geologic Survey, 1948.