--subject headings beginning with the word Tropical; and subdivisions Tropics and Tropical conditions under subjects, e.g. Agriculture--Tropics; House painting--Tropical conditions
Zones of transitions -- See Inner cities Here are entered works on densely populated, usually deteriorating, central areas of large cities, inhabited predominantly by poor people, often of a specific ethnic group, and on the social and economic problems of these areas.
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Zones, Postal -- See Postal zones Here are entered works on geographical areas used to determine postal rates or for administrative purposes within postal systems. Works on numeric coding systems used for postal delivery are entered under Zip code.
--subject headings beginning with the word Tropical; and subdivisions Tropics and Tropical conditions under subjects, e.g. Agriculture--Tropics; House painting--Tropical conditions
