Columbia subject headings:
Harvard subject headings:
Pollution--Hudson River Watershed (N.Y. and N.J.)--Toxicity.
Water--Pollution--Hudson River Watershed (N.Y. and N.J.)
Princeton subject headings:
Pollution--Hudson River Watershed (N.Y. and N.J.)--Toxicity.
Water--Pollution--Hudson River Watershed (N.Y. and N.J.).