• William Bateson (1861-1926) (John Innes Centre Historical collections and Cambridge University). Bateson's correspondence contains much of importance to the beginnings of human genetics. www.jic.ac.uk/corporate/search/BatesonLetters/default.asp
• Cyril Dean Darlington (1903-1981) (John Innes Centre Historical Collections) www.jic.ac.uk and Bodleian Library Oxford
• Sir Ronald Aylmer Fisher (1890-1962) (RA Fisher digital archive, University of Adelaide) http://digital.library.adelaide.edu.au/coll/special/fisher
• Sir Francis Galton (1822-1911) (UCL Special Collections) www.ucl.ac.uk/library/special-coll
• Karl Pearson (1857-1936) (UCL Special Collections) www.ucl.ac.uk/library/special-coll