Author
O'Sullivan, Robert Brett, 1923-
Geological Survey (U.S.)
28
United States. Bureau of Indian Affairs
10
Geological Survey (U.S.),
8
Navajo Tribe of Arizona, New Mexico & Utah
8
Scott, Glenn R., 1918-2012
8
Weide, David L.
4
Heller, Joan S.
3
Pipiringos, G. N. 1918-
3
Beaumont, Edward C.
2
Hail, William J. Jr., 1922-2018
2
Duncan, Donald C., 1911-1990,
1
Hail, William J. Jr., 1922-2018,
1
Mytton, James W.
1
Smith, Marjorie C.
1
Strobell, J. D.
1
United States. Bureau of Indian Affairs,
1
United States. National Park Service
1