Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Paleozoic--Bibliography.
Geology, Stratigraphic--Proterozoic--Bibliography.
Geology--Great Basin--Bibliography.
Princeton subject headings:
Geology, Stratigraphic--Paleozoic--Bibliography.
Geology, Stratigraphic--Precambrian--Bibliography.
Geology--Great Basin--Bibliography.