2 To protect confidentiality, if three or more vessel operating
companies do not carry a particular commodity from a state of origin to a state
of destination, then that commodity is reclassified to "unknown and not elsewhere
classified products."
SOURCE FOR DATA ON THIS PAGE: U.S. Army Corps of Engineers, Waterborne Commerce
Statistics Center, State to State and Region to Region Commodity Tonnages, Public
Domain database, available at http://www.wrsc.usace.army.mil
as of Oct. 30, 2001.