Typed letter with handwitten additions and postscript from H.J. Muller to Elof Carlson regarding who to consult about writing a biography of Muller, 1963.
Typed letter with handwritten corrections from H.J. Muller to Elof Carlson regarding Elof's book "The Gene", Muller's additions to "Out of the Night", and Elof's request to write a biography of Muller, 1966.