Government Agencies:
Customs & Border Protection:  cbp.gov
Food & Drug Administration:  fda.gov
Bureau of Industry & Security:  bis.doc.gov
Transportation Security Administration:  tsa.gov
Department of Homeland Security:  dhs.gov
Office of Foreign Asset Control:  treas.gov/offices/enforcement/ofac
Fish & Wildlife:  fws.gov
Federal Maritime Commission:  fmc.gov
Federal Aviation Administration:  faa.gov
Department of Transportation:  transportation.gov
Federal Trade Commission:  ftc.gov
US Census Bureau:  census.gov
Department of Agriculture:  usda.gov

Resources:
United Nations Location Code (UNLOCode):  www.unece.org/cefact/locode/service/location
Conversation Tables:  www.convert-me.com/en
International Calling Codes:  www.countrycallingcodes.com
Wood Packing Requirements:  www.ispm15.com