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Products have been classified by the Harmonized Schedule B classification system of the U.S. Bureau of the Census. The prices used are generally either "free alongside ship" (f.a.s.) factory or "free on board" (f.o.b.) transaction prices, depending on the practices of the individual industry. Prices used in the grain index, excluding rice, are obtained from the U.S. Department of Agriculture.

Series IDs in FRED maintain the harmonized code system. To see the hierarchy of codes, visit http://www.census.gov/foreign-trade/reference/codes/#hts.
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