C.606-C.614: Beecham Group plc., 1970-1991, n.d. Beecham was a manufacturer of semi-synthetic penicillins. In 1959 the company succeeded in isolating the penicillin nucleus '6-APA'. Correspondence, mostly regarding requests for chemical samples for research and exchanges of information. Included are correspondence and papers regarding the Beecham Colloquium (September 1981): at C.612 is a copy of a transcript of a discussion at the colloquium 'The Control of Antibiotic-resistant…