National Park Service (COR)
(7)
Edwin C. Bearss/ National Park Service/ U.s. Department of Interior
(1)
George E. Davidson/ National Park Service
(1)
National Park Service (COR)/ Ronnie C. Tyler
(1)
National Park Service/ G. Frank Williss
(1)
National Park Service/ Marie Tyler-McGraw
(1)
National Park Service/ Richard J. Hartesveldt
(1)
Richard M. McMurry/ Bell Irvin Wiley (EDT)/ National Park Service/ Bell Irvin Wiley
(1)
Robert C. Alberts/ National Park Service
(1)
Robert M. Utley/ National Park Service
(1)
U.s. Department of the Interior Bureau of Reclamation (COR)/ National Park Service (COR)/ David P. Billington
(1)
United States National Park Service
(1)