Columbia subject headings:
Ballinger, Richard A., 1858-1922.
Pinchot, Gifford, 1865-1946.
United States. Department of the Interior.
United States. Forest Service.
Harvard subject headings:
Ballinger, Richard A., 1858-1922
Pinchot, Gifford, 1865-1946.
United States. Department of the Interior.
United States. Forest Service
Princeton subject headings:
Ballinger, Richard A., 1858-1922.
Pinchot, Gifford, 1865-
United States. Department of the Interior
United States. Forest Service