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• Irani, M. C.; Jansky, J. H.; Jeran, P. W.; Hassett, G. L.
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  Methane Emission From U.S. Coal Mines in 1975, A Survey. A Supplement to Information Circulars 8558 and 8659.
  Bureau of Mines, Pittsburgh, PA
  IC 8733
  IC 8733
  1977
  58 p.