US Bureau of Customs and Border Protection
FAST Application Information.

Customs - Information for Visitors to Canada
The Canada Customs and Revenue Agency (CCRA) wants to help travellersfind the information they need to know in order to enter Canada.

US Department of State - Bureau of Consular Affairs
US Customs; Bringing Food, Plant and Animal Products into the US; Foreign Consular.

Australian Customs Service
Information on customs procedures, requirements and the facilitation and concession schemes it administers.