HMT - This link will take you to the Hazardous Materials Table. Government site.

49CFR Transportation - Hint DO NOT click on the link under the "part" as this will load the entire part of the code, use the links under the "table of contents" header to go to the various subparts. Government site.

Special Provisions - This will take you to Special Provisions and the IB code table. Government site.

HMT - This is a generic link and not Government run, but is easier to find your materials listed in the HMT.