Ronald Reagan,
Proclamation 4904
“ By Proclamation 4768 of June 28, 1980, the President modified the TSUS by adding numerous provisions to schedule 4 thereof for "products provided for in the Chemical Appendix to the Tariff Schedules" and by adding a Chemical Appendix to the TSUS. This action was taken under the authority of section 503 (a) (1) of the Trade Agreements Act of 1979 (93 Stat. 251) . The Chemical Appendix lists chemicals and products which the President has determined were imported into the United States before January 1, 1978, or were produced in the United States before May 1, 1978. ”
