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- '''Revised:''' Revised & reissued 23 June 1974 as BTB (revision in italics). '''Cancels:''' HCO Bulletin of 7 April 1972, same title. ...9 KB (1,693 words) - 20:54, 8 February 2026
- 1. [[HCO|HCO]] [[BULLETIN|Bulletin]] 16 April 1972, [[PTS|PTS]] RD [[CORRECTION_LIST|Correction List]]. It also gives the expe ''(BTB 11 Aug 72RA)'' ...1 KB (176 words) - 19:20, 20 December 2025