Typed letter with handwritten additions from H.J. Muller to Elof Carlson regarding a colleague's (William R. Lee) trip to California and about a Irwin Oster, 1963.
Typed letter with handwritten additions and postscript from H.J. Muller to Elof Carlson regarding Joravsky's writing on Serebrovsky, Lysenkoism, Isreal Agol, and Soloman Levit, 1962.