Letter from Sydney Brenner to William D. McElroy #1, 27/03/1956
Letter from Sydney Brenner to William D. McElroy #2, 22/12/1955
Letter from Sydney Brenner to William D. McElroy #3, 29/01/1956
Letter from William D. McElroy to Sydney Brenner #1, 6/1/1956
Letter from William D. McElroy to Sydney Brenner #2, 13/12/1955
Tentative program for the Symposium on the Chemical Basis of Heredity at Johns Hopkins University, 1955-1956