John Simmons Papers (1924-1994), Ref: GB 152 GB 152 MSS.363,
https://archiveshub.jisc.ac.uk/search/archives/80e05c8d-6acf-3e84-8999-1a9a8321cad5.
See John Simmons Archive at Warwick University Modern Records Centre Showcase:
Pioneers: Innovators in Science and Technology
http://www2.warwick.ac.uk/services/library/mrc/explorefurther/images/pioneers/ for a
number of items on LEO, now digitised, see
www.warwick.ac.uk/services/library/mrc/explorefurther/digital/leo
Boxes of manuscripts from David Caminer and John Aris are catalogued at
http://mrc-catalogue.warwick.ac.uk/records/ARI/2 Note (April 2019) 9 boxes have been
transferred to Cambridge Centre for Computer History as part of HLF project. For full
list see LEOPEDIA annex