Columbia subject headings:
Mammals, Fossil--Rocky Mountains.
Paleontology--Canada, Western.
Paleontology--West (U.S.)
Harvard subject headings:
Mammals, Fossil--Rocky Mountains.
Paleontology--Canada, Western.
Paleontology--West (U.S.)
Princeton subject headings:
Mammals, Fossil--Rocky Mountains.
Paleontology--Canada, Western.
Paleontology--West (U.S.)