Typed letter with handwritten corrections from H.J. Muller to Elof Carlson regarding a manuscript by Elof and Drosophila genetics, 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.

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 with handwritten corrections from H.J. Muller to Elof Carlson regarding a manuscript by Elof and genetic mutations, 1960.

Typed copy of a letter with out signature from Elof Carlson to H.J. Muller regarding Drosophila genetics, a publication of Muller's major works, and the work of Carl Sagan, 1960.

Typed letter from H.J. Muller to Elof Carlson mentioning Carl Sagan's work, an enclosed abstract on genetics, and a Drosophila conference, 1960.

Typed letter with handwritten corrections and postscript from H.J. Muller to Elof Carlson, 1960.

Typed letter from H.J. Muller to Elof Carlson, 1960.

Typed letter from H.J. Muller to Elof Carlson regarding Elof's appointment to UCLA and about the difficulties of presenting resonable eugenics ideas to the public due to the influence of the Nazis and those who continue to think like them, 1960.

Handwritten letter from N. Timofeeff-Ressovsky to H.J. Muller regarding Drosophila genetics, 1930.