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Observation of rogue prevalence in established varieties; typescript reports (1952): unripe fruit colour of dwarf varieties, earliness trial of dwarf varieties, hybrid vigour; distribution of seed of JI varieties; MS report 'Rogues in Tomatoes'.

Bundle of letters re Roderick MacLeod: Bundle of letters regarding MacLeod's admission/finances as a 3 year Cambridge research student working at the VRU, 1960. Letter to the Murdo Macaulay Trust from Roy Markham re MacLeod's progress and progression to Ph.D.candidate, 31 May, 1961. Leaflet: Wellcome Research Travel Grants, Sep 1961. Letter from MacLeod to M Hollings, Glasshouse Crops Research Institute, Rustington, re plant viruses, 5 Nov 1962. Bundle of letters re scholarships/awards etc. for Macleod to spend three years in the USA as a Post-doctorate research scholar with Prof. LM Black at the Uni. of Illinois and Dr Peter Moran at the National Cancer Research Inst., Maryland, 1963. Letter btw Dr A M Pleid, Public Health Lab Service, London and MacLeod re wound tumour virus and reoviruses, 19 July, 1 Aug 1963. Dr Robert J Shepherd to Roy Markham re paper with MacLeod on turnip yellow and wild cucumber mosaic viruses, 27 March, 10, 19, 29 July 1963. Leaflet: Fulbright Travel Grants, 1963-4

Rocky Mountain Rarities From Colarado, Upton Gardens, Mrs K N Marriage

Rocky Mountain Rarities From Colarado, Upton Gardens, Mrs K N Marriage

Rock and Alpine Plants, Dwarf Shrubs and Alpine Sundries 1939, Stuart Boothman, Nightingale Nursery, Maidenhead

Robson Seeds, Seventeenth Annual Descriptive Catalogue, Robson Seed Farms, Hall, Ontario County, New York

Robinsons Eltham, Our Catalogue 1937 - 38, J Robinson & Sons, Cannock House Gardens, 60 North Park, Eltham

Robert W Wallace (Landscape & Garden Architects) to AD Hall: Tulipa greigii

Robert Peter van Tubergen, Yale Biophysics Dept., New Haven, Connecticut, USA: visiter worker at the VRU on a post doctoral US Public Health Service Fellowship 1959: Letters btw Roy Markham and RPvT, 5 March (incl. research proposal and scholarship notification/certificate), 6 April, 1959, 28 Aug, 12 Sep, 28 Nov, 1960, 4 Jan, 28 Jun 1961, 12 March 1965: admin, personal and work news. RPvT went on to work at the Rockefeller Institute, USA.

Bundle of letters between Dr Robert N Campbell, Dept.of Plant Pathology, University of California, USA and Roy Markham re Public Health Service Special Fellowship to work at VRU (starting Aug 1966), some letters re previous short visit in 1963, proposed work on the radish mosaic virus, 29 May 1963-26 July 1966 Letter to RNC from G J Hills re VRU news/gossip, manuscript, move to Norwich, 16 May 1968