Report of investigations, R. I. 4085-R. I. 4146 (with omissions). 4109. Flood-prevention projects at Pennsylvania anthracite mines, progress report for 1945 [with list of references]; by S. H. Ash, W. E. Cassap, James Westfield, W. L. Eaton, W. M. Romischer, E. J. Podgorski, and L. H. Johnson.

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