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1. 1990 census transportation planning package. PA
   TD 1.56/2:BTS-CD-02-04
2. 1990 census transportation planning package. MI, OH
   TD 1.56/2:BTS-CD-02-05
3. 1990 census transportation planning package. IL, IN
   TD 1.56/2:BTS-CD-02-06
4. 1990 census transportation planning package. IA, MN, WI
   TD 1.56/2:BTS-CD-02-07 A
5. 1990 census transportation planning package. KS, MO, ND, NE, SD
   TD 1.56/2:BTS-CD-02-08