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Americans with Disabilities Act (ADA): Accessibility Guidelines for Buildings and Facilities, Transportation Facilities, Transportation Vehicles
Y 3.B 27:8 AM 3/2

Economic Census (1997): Transportation and Warehousing: Geographic Area Series
C 3.277:

Motor Freight Transportation and Warehousing Survey
C 3.138/3-5:

National Transportation Statistics
TD 12.1/2:

The Nationwide Personal Transportation Survey
TD 1.56:N 21/

Statistical Abstract of the United States
C 3.134:[yr.]

Transportation Annual Survey
C 3.138/3-5:

TRIS Online

World Factbook
PREX 3.15: