22. Joshua Lederberg and Luca Cavalli-Sforza in a playful mood Date: [ca. July 1956] Genre: Photographic prints
25. Gene Recombination in Escherichia coli Creator: Lederberg, JoshuaTatum, Edward L. (Edward Lawrie), 1909-1975 Date: 19 October 1946 Publisher: Nature Magazine Genre: Articles
26. Letter from Joshua Lederberg to Kimball Atwood Creator: Lederberg, Joshua Date: 15 July 1946 Genre: Letters (correspondence)
27. Letter from Francis J. Ryan to Joshua Lederberg Creator: Ryan, Francis J. (Francis Joseph), 1916-1963 Date: March 1946 Genre: Letters (correspondence)
28. Letter from Francis J. Ryan to Joshua Lederberg Creator: Ryan, Francis J. (Francis Joseph), 1916-1963 Date: 17 August 1945 Genre: Letters (correspondence)
29. Letter from Joshua Lederberg to Francis J. Ryan Creator: Lederberg, Joshua Date: 18 May 1946 Genre: Letters (correspondence)
30. Letter from Joshua Lederberg to Francis J. Ryan Creator: Lederberg, Joshua Date: 2 August 1946 Genre: Letters (correspondence)