Author
United States. Bureau of Mines
9
Williams, Lloyd
7
Hershey, Robert E.
3
Sayrs, Richard L.
2
Warner, A. H.
2
Ballard, T. J.
1
Clayton, Austin B.
1
Crentz, William L.
1
Dahners, Laurence A.
1
Dempsey, William J.
1
Gandrud, B. W. 1894-
1
Hickman, R. C.
1
Hickman, Robert C.
1
Johnston, T. L.
1
Kline, M. H.
1
Lamont, W. E.
1
Lowe, R. W.
1
McIntosh, Frank K.
1
McMaster, Patrick D.
1
Miller, J. W.
1
Morrison, G. A.
1
Robertson, Almon F.
1
University of Alabama
1