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1. Nationwide personal transportation survey
   TD 1.56:N 21/
2. Traffic safety CD-ROM, 1996
   TD 1.56: T 67/996
3. Transportation Satellite Accounts : a new way of measuring transportation services in America
   TD 1.56:T 68/1x
4. United States waterway data a compilation of waterway databases, reports, and graphics
   TD 1.56:W 31