The Tariff Schedule of the United States Annotated (TSUSA)
Here are links to the sections of the last TSUSA in use before the introduction of the Harmonized Tariff Schedule in 1989. The TSUSA was last printed in 1987 and was supplemented three times and continued to be used in 1988.
The links are to adobe .pdf files. The scans are image only; that is, you cannot search for specific text.