Showing 1 - 2 results of 2 for search 'Ackerman, M. J.', query time: 0.03s Refine Results
  1. 1
    Costs of mining under bolted roof and timbered roof in bituminous coal mines /

    Costs of mining under bolted roof and timbered roof in bituminous coal mines / by Ackerman, M. J.

    Published 1961
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  2. 2
    Hydraulic coal mining research : equipment and preliminary tests /

    Hydraulic coal mining research : equipment and preliminary tests / by Wallace, Joseph J.

    Published 1961
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