You can contact the USITC using the form here: https://www.usitc.gov/applications/dataweb/dataweb_5_help

When using these data, the USITC suggests that the following citations be used:

Citations to merchandise trade data (imports/ exports):

Source: Compiled using the U.S. International Trade Commission’s DataWeb (https://dataweb.usitc.gov/) from official U.S. merchandise trade statistics published by the U.S. Department of Commerce, Census Bureau, accessed XXX.

Citations to tariff data:

Source: U.S. International Trade Commission’s Tariff Database, accessed via DataWeb (https://dataweb.usitc.gov/) on XXX. For official tariff information, however, please refer to the U.S. Harmonized Tariff Schedule (HTS) available at https://hts.usitc.gov/.

The commodity translation tool allows users to translate individual numbers using a known HTS, SITC, or NAICS number.