Geology and mineral resources of the Honeybrook and Phoenixville quadrangles, Pennsylvania - Bascom, F. (Florence), 1862-1945.; Stose, George Willis, 1869-1960 (Washington, U.S. Govt. Print. Off., 1938)
At head of title: United States Department of the Interior...Geological survey...
Keywords: Geology -- Pennsylvania; Mines and mineral resources -- Pennsylvania