Columbia subject headings:
Geology--Periodicals.
Geology--Rocky Mountains--Periodicals.
Paleontology--Periodicals.
Paleontology--Rocky Mountains--Periodicals.
Harvard subject headings:
Princeton subject headings:
Geology--Periodicals.
Geology--Wyoming--Periodicals.
Paleontology--Periodicals.
Paleontology--Wyoming--Periodicals.
Periodicals.