These files include most current 10-digit HS import and export codes as well as equivalent codes in other classification systems. Please read the structure files below to know which calssification systems are included. These files include codes that are not valid in AES. AES users should use the files available from the AES Document Library. (These five files are included in "ZIP ASCII file Schedule B/HTSUS" which is listed under "Schedule B Search Engine - Downloads")