以下几个网址大家按需自取！
1. WITS: Product Concordance      Custom Query   World Integrated Trade Solution (WITS) offers information about various product nomenclatures and help with mapping between various product nomenclatures.
网址：https://wits.worldbank.org/product_concordance.html


2. UN Trade Statistics:
CORRESPONDENCE TABLES网址：https://unstats.un.org/unsd/trade/classifications/correspondence-tables.asp

3. （搬运者认为这个网址还是很全面的）UN Statistics Division：Classifications on economic statistics
原网址介绍：This page contains resources related to classifications on economic statistics. These resources include electronic versions of complete classifications publications (typically in PDF format), as well as electronic versions of the classifications in plaintext (CSV), Microsoft Access 2000-2003 and/or JSON (formatted for select2.js). Please read carefully the “Readme” or “Notes” files if they are present in the download, because they contain important information on the changes, updates, and corrigenda for the downloaded resource. To purchase a copy of the publications, please visit the United Nations Publications website.
网址：https://unstats.un.org/unsd/classifications/Econ#Correspondences

希望对大家有帮助！