Description About Commodity and Other Coding Classifications 

Export Commodity Classification - schedule.b.txt

Classification of Country and Territory Designations - 
  ctrycode.txt  - in country code order
  ctryname.txt  - in country name order
  ctryiso.txt  -- in iso code order

Classification of U.S. Customs Districts and Ports - 
  portcode.txt - in district/port code order  
  portname.txt - in port name order

Classification of Foreign Ports by Geographic Trade Area and Country -  
  fprtcode.txt - in foreign port code order
  fprtname.txt - in foreign port name order
  fprtctry.txt - in foreign coutry order