Columbia subject headings:
Conservation of natural resources--Bibliography--Catalogs.
Conservation of natural resources--Bibliography.
Ecology Action Centre. Ecology Action Resource Centre--Catalogs.
Ecology Action Resource Centre (Halifax, N.S.)--Bibliography--Catalogs.
Ecology--Bibliography.
Environmental policy--Bibliography--Catalogs.
Environmental policy--Bibliography.
Human ecology--Bibliography--Catalogs.
Pollution--Bibliography.
Power resources--Environmental aspects--Bibliography--Catalogs.
Harvard subject headings:
Conservation of natural resources--Bibliography--Catalogs.
Ecology Action Centre. Ecology Action Resource Centre--Catalogs.
Environmental policy--Bibliography--Catalogs.
Human ecology--Bibliography--Catalogs.
Power resources--Environmental aspects--Bibliography--Catalogs.
Princeton subject headings: