Plans Folder D.1. Architects' plans January, March 1960 for laboratory on Addenbrooke's site. Folder D.2. Architects' plans June 1966 for extension. Correspondence, memoranda, negotiations on extension to laboratory, mainly conducted by Perutz 1963-1964 with MRC, but including research notes and ideas from colleagues and also a little later material. Folder D.3. 1963. Folder D.4. 1964. Folder D.5. Miscellaneous later…