Editions of the Harmonized Tariff Schedule of the United States Annotated (HTSA) are available from 1989 (the first year of publication) - present.
Note that due to changes in software and formats, many of the early files do not contain all the graphics and header information as was originally printed. They do, however, contain the necessary information to look up duty rates that were in effect at the time.
Select editions are available below in HTML format. Some editions are also available as CSV, XLS, or JSON file downloads.