TRANSPORTATION (TN)

 

A primary category containing information pertaining to passenger and freight transportation by rail, highway or water.  Including services such as stevedoring, backing, loading and unloading, pipe line transportation, warehousing (in transit).

 

Subject categories and sub-categories fully available for research are bolded. Closed categories and sub-categories have a simple phrase describing their contents.

 

                                 DESCRIPTION OF SECONDARY FILE CODES

 

File Code                         Description

 

TN                                  Transportation

 

TN001                             Highway Transportation

 

TN001-01                        Motor Pool

 

TN002                             Interurban Transportation

 

TN002-01                        Metropolitan D.C. Subway System

 

TN003                             Pipeline

 

TN004                             Railroad

 

TN005                             Water