This report is the fourth in a series concerning the Bureau of Mines program for microfilming maps of abandoned mines in the Pennsylvania anthracite region; a catalog of the microfilmed maps of 76 mines in the western middle field is presented. Previous reports were catalogs of microfilmed maps of mines in the eastern middle field and in the Wyoming and Lackawanna Basins of the northern anthracite field. Additional catalogs will be published as the microfilming of significant mining areas is completed.
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