USA Trade Online is the official source for U.S. Export and Import Statistics (U.S. Census Bureau)
A number of government and official bodies collect and disseminate trade and statistical data. Websites to start with include:
Other helpful websites:
Exporters' Encyclopedia REF HF3011 .E9 Provides target market information arranged alphabetically by country and divides each country market into country profile, communications, key contacts, trade regulations, documentation, marketing data, transportation and business travel.
Importers Manual USA REF HF3035 .I45 A sourcebook for the process of importing into the U.S. and provides information on international legal issues, international banking and letters of credit, U.S. customs entry, packing, shipping and insurance. Also available full text. See first box above.
Official Export Guide (3 volumes)
Websites that provide samples of various international trade forms: