Columbia subject headings:
Soils--Phosphorus content--New York (State)
Water pollution control industry--Ontario, Lake (N.Y. and Ont.)
Water--Phosphorus content--New York (State)
Harvard subject headings:
Princeton subject headings:
Soils--New York (State)--Phosphorus content.
Water pollution control industry--Ontario, Lake (N.Y. and Ont.).
Water--New York (State)--Phosphorus content.