Correspondence of Dr. George M. Mackenzie with friends and associates of Karl Landsteiner; memoranda of conversations; notes and recollections of Landsteiner by Thomas M. Rivers, 1944-1952, and by Max Neuberger; Landsteiner's departmental reports at Rockefeller Institute, 1923-1943; correspondence on publications. There is much material on immunology, the study of blood, the Nobel award, 1930, antisemitism, and the Vienna medical schools.

This collection contains correspondence and reports and documents Florence Seibert's work at Yale University, under Lafayette Benedict Mendel; at the University of Chicago, under H. Gideon Wells; and at the Henry Phipps Institute at the University of Pennsylvania, 1932-1959. There are cancer research folders concerning her later work at the Mound Park Hospital Foundation and the Bay Pines V. A. Center, in St. Petersburg, Florida. There are also substancial amounts on Goucher College (her alma mater); Lilly Research Laboratories; Merck, Sharpe & Dohme; and Parke, Davis & Company.