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1 Includes air, parcel, postal, courier, other, and unknown.2 Excludes most shipments of crude oil. 3 Pipeline data are not published because of high sampling variability or other reasons.
Percentages may not add to 100 due to rounding
U.S. Department of Commerce, Census Bureau, 1997 Economic
Census1997 Commodity Flow Survey, Hazardous Materials (Washington, DC: December 1999), table 1.