Columbia subject headings:
Harvard subject headings:
Hazardous wastes--Bibliography.
Hazardous wastes--Information services--Directories.
Refuse and refuse disposal--Bibliography
Refuse and refuse disposal--Information services--Directories.
Princeton subject headings:
Factory and trade waste--Bibliography.
Factory and trade waste--Information services--Directories.
Hazardous wastes--Bibliography.
Hazardous wastes--Information services--Directories.