Typed letter with handwritten calculations in the margin from Lewis Mott-Smith to H.J. Muller, 1929. Typed letter with handwritten calculations in the margin from Lewis Mott-Smith to H.J. Muller, 1929.
Typed letter with handwritten additions from Julian Huxley to H.J. Muller, 1940. Typed letter with handwritten additions from Julian Huxley to H.J. Muller, 1940.