FCC Office of Engineering and Technology (OET) — The Office of Engineering and Technology (OET) advises the FCC concerning engineering matters, including EMC and RF emissions. OET also maintains an online database of devices that are capable of emitting radiofrequency energy when in use at http://www.fcc.gov/oet/fccid/
Federal Register (Rules & Regulations) — The Federal Register is the official daily publication for Rules, Proposed Rules, and Notices of Federal agencies and organizations. Copies of the FCC Rules and Regulations are available for download, including Part 68.
United States Customs Services (Import & Export) — The US Customs Service maintains a web site of useful information pertaining to import and export issues related to duty rates, HTS, rulings and regulations, small importer, publications and forms.