Ex. Ord. No. 12843, Apr. 21, 1993, 58 F.R. 21881, which provided for Federal agencies to implement policies and programs to minimize procurement of ozone-depleting substances, was revoked by Ex. Ord. No. 13148, § 901, Apr. 21, 2000, 65 F.R. 24604, formerly set out as a note under section 4321 of this title.