Columbia subject headings:
Geology, Stratigraphic--Carboniferous.
Mountains--United States.
Ouachita Mountains (Ark. and Okla.)
Wichita Mountains (Okla.)
Harvard subject headings:
Geology, Stratigraphic--Carboniferous
Mountains--United States
Ouachita Mountains (Ark. and Okla.)
Wichita Mountains (Okla.)
Princeton subject headings:
Geology, Stratigraphic--Carboniferous.
Mountains--United States.
Ouachita Mountains (Ark. and Okla.)
Wichita Mountains (Okla.)