Columbia subject headings:
Forest reserves--United States--Periodicals.
Geological Survey (U.S.)--Periodicals.
Geology--United States--Periodicals.
Mines and mineral resources--United States--Periodicals.
Water-supply--United States--Periodicals.
Harvard subject headings:
Forest reserves--United States--Periodicals.
Geological Survey (U.S.)--Periodicals.
Geology--United States--Periodicals.
Mines and mineral resources--United States--Periodicals.
Water-supply--United States--Periodicals.
Princeton subject headings:
Forest reserves--United States--Periodicals.
Geological Survey (U.S.)--Periodicals.
Geology--United States--Periodicals.
Mines and mineral resources--United States--Periodicals.
Water-supply--United States--Periodicals.