Columbia subject headings:
Harvard subject headings:
Agriculture--Tropics
Frontier and pioneer life--Tropics.
Land settlement--Tropics.
Monbeig, Pierre.
Tropics--Colonization.
Princeton subject headings:
Africa--Economic conditions--Congresses.
Land settlement--Africa--Congresses.
Land settlement--Latin America--Congresses.
Land settlement--Southeast Asia--Congresses.
Latin America--Economic conditions--Congresses.
Southeast Asia--Economic conditions--Congresses.