Columbia subject headings:
Developing countries--Agriculture.
Developing countries--Medical care.
Economic assistance.
Education, Rural--Developing countries.
Harvard subject headings:
Agriculture--Developing countries
Developing countries--Agriculture.
Developing countries--Education.
Developing countries--Medical care.
Economic assistance.
Education, Rural--Developing countries.
Medical care--Developing countries
Princeton subject headings:
Agriculture--Economic aspects--Developing countries.
Economic assistance.
Education, Rural--Developing countries.
Medical care--Developing countries.