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Collection of correspondence with Lipkin starting in 1953. Mainly general, family and work news, some research details and hand drawn experiments, news about various colleagues including Waldo Cohn, Leon Heppel, Jack Abrell, David Dunn, Jack Hitchborn, Mick Johnson, Marianne Mandel, Dick Matthews, C P Snow, Arthur Bancroft.

Letter from the Agricultural Research Council (ARC) offering Markham a position as Principal Scientific Officer in the Virus Research Unit under the Directorship of Dr K M Smith, describing the role, includes two pages of work regulation details.

7 letters between Markham and Lipkin: Lipkin's Guggenheim fellowship and visit to Europe. Dates: RM to DL: 8 Feb 1953, 18 Jul 1954, 26 Jul, 25 Oct 1955. DL to RM: 20 Jul, 1 Aug 1955, 9 Jan 1956

9 letters between Roy Markham and David Lipkin: Tobacco mosaic virus (TMV) , ATP runs, includes hand drawn diagrams of experiments and results by RM. Dates: From RM to DL: 17 Jan, 3 Jul, 20 July, 8 Aug, 16 Aug, 30, Aug 16 Sep and 4 Oct, from DL to RM: 1 Jul, 13 Aug and 23 Sep.

11 letters between Roy Markham and David Lipkin: breakdown of turnip yellow mosaic virus nucleic acid by ethanol, 'coding', cyclic adenylic acid, TYM virus, Leon Heppel, iodoguanosine, visit to America. Dates RM to DL: 5 Mar, 5 Oct, 15 Oct, 22 Nov and 19 Dec. DL to RM: 19 Feb, 15 May, 18 Sep, 6 Nov, 3 Dec (x2).

7 letters: RM to DL: 31 March, 6 June, 6 July, 25 Dec. DL to RM: 4 June, 30 Nov 1963 and 23 Jan 1964, : general personal news, electron microscopy, ncyclic nucleitide compounds; David Dunn and Jack Hitchborn, Mick Johnson, acyl groupings in viruses, coding with synthetic polynucleotides, TMV, RNA and other chemical/enzyme experiments with hand drawn diagrams; Waldo Cohn, building of the new labs at the John Innes Centre.

8 letters: RM to DL: 4 Feb, 15 June, 31 Dec. 1DL to RM: 12 Jan, 22 May, 5 March, 25 June : visit to USA, Marianne Mandel, Dick Matthews, TMV protein, general work gossip. Letter to Dr R R Palmer, Washington University turning down a position, 30 Nov 1965.

5 letters: RM to DL: 3 Sep 1967, 7 March, 22 April 1968. DL to RM: 8 March, 24 April 1968. RM about taking on the directorship of John Innes and the move to Norwich; the current state of staff, facilities, finances etc., Bert Baker, Sidney Elsden, Maurice Rees, Dick Synge, Waldo Cohn, Mick Johnson, work/research, family news, riots in Washington, Baltimore and Nashville, the Vietnam war, parcel sent to Roy of Mallinckrodt nickel sulfate.

1 letter from DL to RM, 19 June 1969: about RM's coming visit to USA and DL's son called up for service (Vietnam war).

Bundle of 3 letters [c early 1970s]: to Mr & Mrs Markham from T/Jerry? S headed 'The White House, Ludham' about a dinner party attended by the Markhams, mentions the artist Edward Seago (who lived in Ludham) and Bridget Bacton; to Mrs Markham thanking her for hospitality; to Roy from Stanford University, California; also includes a St Paul's School bursar receipt (1929) and a newspaper cutting (c 1970s).