Maps illustrating an investigation of barrier pillars in the Western Middle field as part of the comprehensive study of mine-water problem in the anthracite region of Pennsylvania. Scale 1:4,500 feet. Included in the set is a graph (Figure 8) showing the relationships between pumping loads in the anthracite region of Pennsylvania with altitude on the x-axis and distance (in miles) from the Conowingo Portal on the y-axis. An explanation of the graph in Figure 8 (Figure 9) summarizes data from Bureau of Mines Technical Paper 727, Report of Investigations 4700, and Bulletin 513.

Report issued by the Bureau of Mines over studies on the reserves of coking coal from Allegheny County, Pennsylvania. The results of the investigations and the different coal beds sampled are presented. This report includes tables, and maps.

Report issued by the U.S. Bureau of Mines regarding an investigation of the reserves of coking coal in Somerset County, Pennsylvania. The report includes tables and maps representing different coal beds within Somerset County.

From Forward: "This bulletin is the first of a new series, which includes analyses of only tipple and delivered coal. It covers samples collected throughout the United States from July 1, 1947 to June 30, 1950 (fiscal years 1948-50). It is planned that future publications of this series will cover a period of one fiscal year only and be issued as soon as possible after June 30 of each year."

From Introduction: "The investigation of barrier pillars in the Southern field is part of the comprehensive study of the mine-water problem in the anthracite region of Pennsylvania by the Federal Bureau of Mines (1, 2, 5, 6, 7, 8, 9, 10, 11, 12, 15, 16, 18).

From Scope of Report: "This report discusses the nature of stream-bed and surface seepage problems and mentions remedial measures devised by some anthracite-mining companies to prevent seepage of surface water into their mines."

From Scope of Report: "This report summarizes the engineering study conducted during 1952 by engineers of the Federal Bureau of Mines seepage of surface water into mine workings underlying the Western Middle field drainage area."

From Summary: "The investigation of barrier pillars in the Western Middle field is part of the comprehensive study of mine-water problem in the anthracite region of Pennsylvania by the Federal Bureau of Mines (1, 2, 5, 6, 7, 8, 9, 10, 11, 12, 15, 16)." From Introduction: "The purpose of this report is to give factual data on barrier pillars that will be helpful in solving the mine-water problem."