Columbia subject headings:
Water--Pollution--Law and legislation--United States.
Water--Pollution--United States--Handbooks, manuals, etc.
Harvard subject headings:
Water--Pollution--Law and legislation--United States
Water--Pollution--United States--Handbooks, manuals, etc.
Princeton subject headings:
Water--Pollution--Law and legislation--United States.
Water--Pollution--United States--Handbooks, manuals, etc.