Author
United States. National Park Service,
23
United States. National Park Service
6
Geological Survey (U.S.)
2
Scott, Glenn R., 1918-2012
2
United States. Army. Corps of Engineers. Portland District,
2
Arizona Council for Enhancing Recreation and Tourism
1
Bonner, John A.
1
Denver Public Library. Western History/Genealogy Department
1
Fox, Joyce
1
Hudson River Valley Greenway (N.Y. : Program)
1
Israel. Agaf ha-medidot
1
Ivey, James E.
1
National Geographic Society (U.S.). Cartographic Division
1
New York (State). Office of Parks, Recreation, and Historic Preservation,
1
Petrie, Brent N.
1
Shupe, John F.
1
Suominen-Summerall, Sally
1
Trimmer, Ethel
1
United States. Central Intelligence Agency
1
United States. Forest Service. Southwestern Region
1
United States. National Park Service. Southwest Region. Division of History
1