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Credit
Letter to Pontecorvo from Professor Hermann Joseph Muller concerning Muller's comments on Joseph Alan Roper's paper (based on Pontecorvo's ideas) on allelism and its discussion of the "position effect" and his comments on another paper about radiation effects. 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.