Columbia subject headings:
Alcohol fuel industry--Developing countries--Case studies.
Irrigation pumps--Developing countries--Case studies.
Renewable energy sources--Developing countries--Case studies.
Harvard subject headings:
Alcohol fuel industry--Developing countries--Case studies.
Irrigation pumps--Developing countries--Case studies.
Renewable energy sources--Developing countries--Case studies.
Princeton subject headings:
Alcohol fuel industry--Developing countries--Case studies.
Irrigation pumps--Developing countries--Case studies.
Renewable energy sources--Developing countries--Case studies.