Author
Geological Survey (U.S.)
4
Geological Survey (U.S.),
3
Ross, Donald C. 1924-
3
Dodge, F. C. W. 1934-
2
Millard, Hugh T., 1935-
2
Elsheimer, H. N.
1
Elsheimer, H. N.,
1
Ficklin, Walter H.
1
National Center for Earthquake Research
1
Saudi Arabia. Deputy Ministry for Mineral Resources
1
Sims, P. K. 1918-2011,
1
Stuckless, John S.
1