In copyright
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Credit
Carbon copy letter (found among H J Muller's correspondence and passed on to Pontecorvo) from Muller to Dr Alan William Greenwood, Director of the Insititute of Animal Genetics at the University of Edinburgh concerning Pontecorvo's thesis (1940). In copyright. Source: Wellcome Collection.
Provider
The original material is held at <a href="http://www.gla.ac.uk/services/archives/" rel="nofollow">Glasgow University Archive Services.</a> This catalogue is held by the Wellcome Library as part of Codebreakers: Makers of Modern Genetics.