Columbia subject headings:
Ecological surveys--Developing countries.
Ecological surveys.
Ecology--Developing countries.
Ecology.
Environmental monitoring--Developing countries.
Environmental monitoring.
Natural resources--Developing countries.
Natural resources.
Harvard subject headings:
Ecological surveys--Developing countries.
Ecological surveys.
Ecology--Developing countries.
Ecology.
Environmental monitoring--Developing countries.
Environmental monitoring.
Natural resources surveys--Developing countries.
Natural resources surveys.
Natural resources--Developing countries
Natural resources.
Princeton subject headings: