Largely notes for and rough drafts of the revised edition of Sabine's chief work, A History of Political Theory, as well as additional books and correspondence.

Incoming correspondence from fellow philosophers, including forty-seven letters from Richard Burdon, Viscount Haldane, in which he discusses the philosophical systems of Hegel and Kant, comments on Cunningham's studies of Hegel and Henri Bergson, and on the writings of Bergson, Bernard Bosanquet, Francis Herbert Bradley, John Dewey, Albert Einstein, Alfred North Whitehead, and others. Reference is also made to world events.

Three letters from Carl Becker to May Elish (1927, 1938, and 1939). Also, lecture notes for Philosophy 5, Professor Gustavus Cunningham (1927); English 41, Joseph Quincy Adams; and English 48a, Professor Frederick Prescott (1928).