1 sheet, cut in 2 for encapsulation Pennsylvania Geological Survey. Series M : Mineral Resources Report Companion text: Detailed description of coal fields / James D. Sisler. Bituminous coal fields of Pennsylvania. Harrisburg: Pennsylvania Topographic and Geologic Survey. 1928. Bulletin. Series M : Mineral Resources Report. Bulletin M-6, pt.II, 1926. 511p. 17pls. Another copy of map with source publication.