Bundle of correspondence between Pontecorvo and Professor Dan Lewis concerning Lewis's work on methionine suppressors and Pontecorvo's Leewenhoek lecture

Photographs of Pontecorvo signing the book of the US National Academy of Sciences, April 1984, plus others of friends and colleagues c1970s-1980s

Reminiscences of Pontecorvo submitted by Dan Lewis

Bundle of correspondence between Pontecorvo, Dr Dan Lewis and Dr Robert Russell Race concerning Dr Lewis's work on mutations in genes controlling pollen antigens and Pontecorvo's research on allelism

Photographs of Pontecorvo with friends and colleagues at the Genetique Somatique Conference, Inserm, 1979, and in Sri Lanka, 1978, plus some of colleague Dan Lewis

Correspondence regarding the Royal Society Leeuwenhoek lecture delivered by Pontecorvo on 6 December 1962

Letters from friends and colleagues congratulating Pontecorvo on his Royal Society Fellowship