Columbia subject headings:
Acid deposition--Environmental aspects--United States--Periodicals.
Acid deposition--Government policy--United States--Periodicals.
Acid precipitation (Meteorology)--United States--Periodicals.
National Acid Precipitation Assessment Program (U.S.)--Periodicals.
Harvard subject headings:
Acid deposition--Environmental aspects--United States--Periodicals.
Acid deposition--Government policy--United States--Periodicals.
Acid precipitation (Meteorology)--United States--Periodicals.
National Acid Precipitation Assessment Program (U.S.)--Periodicals.
Princeton subject headings:
Acid deposition--Environmental aspects--United States--Periodicals.
Acid deposition--Government policy--United States--Periodicals.
Acid precipitation (Meteorology)--United States--Periodicals.
National Acid Precipitation Assessment Program (U.S.)--Periodicals.