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