Typed copy of "The Cytogenetic Resolution of the Ultra-Fine Structure of a Restricted Portion of a Drosophila Chromosome" by H.J. Muller and A.N. Prokovyeva with handwritten corrections by H.J. Muller
The Effect of a Long Established Duplication on the Frequency of Detectable Mutation typed original drafts, and copies of article written in the USSR with handwritten corrections and chromosome maps by Hermann J. Muller