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
TD
World Factbook
PREX 3.15:
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