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Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. Abstract Using data primarily from the 1997 Commodity Flow Survey (CFS) this report develops a series of models for estimating the production and attraction of 41 different SCTG commodity groups for 145 geographic units in the United States; 92 of these are the counties of Indiana. This is followed by the calibration of fully-constrained gravity models for the flow of these commodities.doi:10.5703/1288284313399 fatcat:sprvgmk52fa33iium4drimau3m