Columbia subject headings:
Land use, Rural--Connecticut River Valley.
Land use, Rural--Massachusetts.
Landscape architecture--Connecticut River Valley.
Landscape architecture--Massachusetts.
Landscape protection--Connecticut River Valley.
Landscape protection--Massachusetts.
Harvard subject headings:
Environmental policy--Massachusetts.
Landscape protection--Connecticut River Valley.
Landscape protection--Massachusetts.
Regional planning--Connecticut River Valley.
Regional planning--Massachusetts.
Princeton subject headings: