State planning, research, development and technology transfer work program /
Iowa Department of Transportation, in cooperation with the U.S. Department of Transportation, Federal Highway Administration.

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Item Link Original Source
Limited (search only)   1995/96 University of Iowa
Limited (search only)   1998/1999 Northwestern University
Limited (search only)   1999/2000 University of Iowa
Limited (search only)   2000/01 University of Iowa
Limited (search only)   2001/02 University of Iowa