Slate in Northampton County, Pennsylvania - Behre, Chas. H. (Charles H.) (Harrisburg, Pa., Dept. of Forests and Waters, Topographic and Geologic Survey, 1927)
At head of title: Pennsylvania Geological Survey, fourth series.
Two folded plates and folded maps in pocket.
Bibliographical foot-notes.
Keywords: Slate -- Pennsylvania -- Northampton County; Geology -- Pennsylvania -- Northampton County