HMT - Column 4
Column 4, Identification Numbers, lists the four-digit identification number assigned to each proper shipping name. These numbers provide for quick identification and are used on shipping papers and by emergency responders. Identification numbers preceded by the letters "UN," for United Nations, indicate that the proper shipping name is appropriate for international and domestic transportation. Identification numbers preceded by the letters "NA," for North America, indicate that the proper shipping name is only recognized for domestic transportation.
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