Search Results : EPA National Library Catalog

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  1 Bleeder system in virgin area in a Pittsburgh coalbed mine {electronic resource} / 1973
  2 Methane control by isolation of a major coal panel Pittsburgh coalbed / {electronic resource} : 1973
  3 Methane emission rate study in a deep Pocahontas No. 3 coalbed mine in conjunction with drilling degasification holes in the coalbed {electronic resource} / 1972
  4 Methane emission rate studies in a central Pennsylvania mine {electronic resource} / 1971

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