Columbia subject headings:
Environmental protection--Handbooks, manuals, etc.
Natural resources--Handbooks, manuals, etc.
Pollution--Handbooks, manuals, etc.
Quality of life--Handbooks, manuals, etc.
Harvard subject headings:
Environmental protection--Handbooks, manuals, etc.
Natural resources--Handbooks, manuals, etc.
Pollution--Handbooks, manuals, etc.
Quality of life--Handbooks, manuals, etc.
Princeton subject headings:
Environmental protection--Handbooks, manuals, etc.
Natural resources--Handbooks, manuals, etc.
Pollution--Handbooks, manuals, etc.
Quality of life--Handbooks, manuals, etc.