Showing 1 - 2 results of 2 for search 'DeLong, Richard M.', query time: 0.11s Refine Results
  1. 1
    The Pittsburgh no. 8 and Redstone no. 8A coal Beds in Ohio.
    by DeLong, Richard M.
    Published 1955
    Book
  2. 2
    Coal resources of the lower part of the Allegheny formation in Ohio.
    by DeLong, Richard M.
    Published 1957
    Book
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