Correspondence between Pontecorvo and Professor Tracy Morton Sonneborn concerning research on linkage relations of genes involved in successive steps of biochemical synthesis and homo/hetherothallism

Biographical material relating to Tracy Sonneborn

Typescripts of abstracts from Tracy Sonneborn and colleagues at Indiana University, Bloomington

Correspondence with Tracy Sonneborn

Offprints by Tracy Sonneborn and collaborators

Offprints by Tracy Sonneborn

Strip of negatives from the 100th Meeting of the Genetical Society, Cambridge, 30th June

Photographs of the 100th Genetical Society meeting in Cambridge on 30 June 1949 and of staff at the Institute of Animal Genetics at the University of Edinburgh

Obituaries of various eminent scientists