Copy of a typed letter from H.J. Muller to attendees of his 70th Birthday Party or those who expressed their good wishes for his 70th Birthday with original handwritten note to Elof Carlson thanking him for putting together the celebration, 1961.
Typed letter from H.J. Muller to Elof Carlson regarding the birth of Elof's daughter and a manuscript of Elof's with handwritten note from Muller's secretary, Sue Hickham, 1961.
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.
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.