Columbia subject headings:
Human geography--United States--Bibliography.
Regionalism--United States--Bibliography.
United States--Historical geography--Bibliography.
Harvard subject headings:
Human geography--United States--Bibliography.
Regionalism--United States--Bibliography.
United States--Historical geography--Bibliography.
Princeton subject headings:
Human geography--United States--Bibliography.
Regionalism--United States--Bibliography.
United States--Historical geography--Bibliography.