The papers of Sidney Dancoff include correspondence, notes, typescripts, and reprints. Correspondence is primarily with radiobiologist Henry Quastler, concerning genetics and information theory applied to biophysics. The related notes and data, typescripts by Dancoff and by Dancoff with Murray Gell-Mann, and reprints pertain to evolution and mutation. Other correspondents include Salvador E. Luria, Alvin Novick, and Tracy M. Sonneborn.