--subdivision Climatic factors under individual animals and groups of animals and individual plants and groups of plants, e.g. Fishes--Climatic factors; Corn--Climatic factors
--subdivision Climatic factors under individual animals and groups of animals and individual plants and groups of plants, e.g. Fishes--Climatic factors; Corn--Climatic factors
Here are entered works on trade among nations. Works on foreign trade of specific countries, cities, etc. are entered under headings of the type [place]--Commerce, further subdivided by place, if appropriate. If so subdivided, a second heading is assigned with the place names in reverse positions, e.g. 1. Canada--Commerce--United States. 2. United States--Commerce--Canada.
