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Evaluation of mining constraints to the revitalization of Pennsylvania anthracite : contract no.S0241039 [of the] United States Department of the Interior, Bureau of Mines. 1975 [L
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Evaluation of mining constraints to the revitalization of Pennsylvania anthracite : contract no.S0241039 [of the] United States Department of the Interior, Bureau of Mines. 1975 [L
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Evaluation of mining constraints to the revitalization of Pennsylvania anthracite : contract no.S0241039 [of the] United States Department of the Interior, Bureau of Mines. 1975 [L