Columbia subject headings:
Conservation of natural resources--United States.
Historic sites--Conservation and restoration--United States.
Landscape protection--United States.
United States--Rural conditions.
Harvard subject headings:
Conservation of natural resources--United States.
Historic sites--Conservation and restoration--United States
Landscape protection--United States.
United States--Rural conditions.
Princeton subject headings:
Conservation of natural resources--United States.
Historic sites--Conservation and restoration--United States.
Landscape protection--United States.
United States--Rural conditions.