I'm attempting to find several Federal Register publications:
43 FR 49750, published Oct. 24, 1978
43 FR 51760; Nov. 7, 1978;
49 FR 5323, Feb. 10, 1984;
61 FR 9240, Mar. 7, 1996;
69 FR 31882, June 8, 2004
Unfortunately, all well before archives were maintained electronically. I attempted to search the archive records, but am not finding success. Any suggestions appreciated.