Approximately 12,000 letters to Allan Nevins from various correspondents including James Truslow Adams, Franklin Delano Roosevelt, Harry S. Truman, Willa Cather, Frances Folsom Cleveland, Van Wyck Brooks, Robert Frost, Newton D. Baker, Archibald MacLeish, John D. Rockefeller, Jr., Carl Sandburg, and Henry Wallace; notes and typescripts for Nevins' books including Emergence of Lincoln, The Ordeal of Democracy, Rockefeller, and History and Historians, with notes by editor Ray A. Billington; miscellaneous transcripts, clippings, newspapers, and photographs. Also, autograph letters and manuscripts by presidents, Civil War figures, financiers, politicians, and authors. There are also the Brand Whitlock World War I Diaries and letters to him by such people as Herbert Hoover, Gen. John J. Pershing, and others.

Correspondence, manuscripts, and printed files. The papers deal mostly with Greene's academic career as a history professor at University of Illinois and at Columbia University; with his activities in various professional and social organizations; and, to a lesser extent, his travels, studies, and personal and family matters. Among the major correspondents are such public figures as Louis D. Brandeis, Felix Frankfurter, and James Jules Jusserand; and such prominent historians as James Truslow Adams, Henry Steele Commager, Samuel Eliot Morison, Richard B. Morris, and Allan Nevins.

These papers include the manuscripts of his fourteen books on European history, his research notes, manuscripts and printed copies of his many articles, lectures, contributions to books, and other notes. There is also some correspondence relating to his writings. In addition there are 16 letters from Albrecht-Carrié to Professor Stephen Koss, discussing University matters and international affairs.