--subject headings beginning with the word Tropical; and subdivisions Tropics and Tropical conditions under subjects, e.g. Agriculture--Tropics; House painting--Tropical conditions
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.
Here are entered works on geographical areas used to determine postal rates or for administrative purposes within postal systems. Works on systems of numeric or alphanumeric codes used to expedite sorting and delivery of mail are entered under Postal codes.
--subject headings beginning with the word Tropical; and subdivisions Tropics and Tropical conditions under subjects, e.g. Agriculture--Tropics; House painting--Tropical conditions
