Bayerische Staatsbibliothek, Munich
Deponat Weber-Schäfer (Max and Marianne Weber Papers)
Boston Public Library, Special Collections
Hugo Münsterberg Papers
Bryn Mawr College Archives
Martha Carey Thomas Papers
Bundesarchiv Koblenz
Lujo Brentano Papers
Georg Jellinek Papers
Cincinatti Historical Society, Cincinatti, Ohio
Hans and Margarethe Conrad Haupt Papers
Columbia University Rare Book and Manuscript Library
Felix Adler Papers
Edwin R. A. Seligman Papers
Deutsche Staatsbibliothek Handschriftenabteilung, Berlin
Adolf von Harnack Papers
Geheimes Staatsarchiv Preussischer Kulturbesitz, Berlin
Werner Sombart Papers
Max Weber Papers
George Allen and Unwin Archive, University of Reading Library
Harvard University Archives and Houghton Library
Charles W. Eliot Papers
William James Papers
Talcott Parsons Papers
William Z. Ripley Papers
Helen Frances Garrison and Oswald Garrison Villard Papers
Haverford College Library, Special Collections
Rufus Matthew Jones Papers
Isaac Sharpless Papers
The Johns Hopkins University, Milton S. Eisenhower Library Archives
Jacob C. Hollander Papers
Knox County, Tennessee Public Library, McClung Historical Collection
Library of Congress, Special Collections and Archives
Simon Newcomb Papers
Robert Latham Owen Papers
Booker T. Washington Papers
Michigan State University Library, Special Collections
Paul Honigsheim Papers
Missouri Historical Society, St. Louis
Northwestern University Library, Special Collections
Edmund J. James Papers
James Taft Hatfield Papers
Oklahoma Historical Society, Oklahoma City
Robert Latham Owen Papers
Radcliffe College, Schlesinger Library
John Graham Brooks Papers
Morgan-Howes Family Papers (Ethel Dench Puffer Howes)
St. Louis Art Museum Archives
Louisiana Purchase Exposition
University of Chicago Regenstein Library, Special Collections
William R. Harper Presidential Papers
Frank Knight Papers
Edward Shils Papers
Albion Small Papers
University of Massachusetts W.E.B. Du Bois Library, Special Collections
W.E.B. Du Bois Papers
University of Tennessee Library, Special Collections
Verlag Archiv Mohr/Siebeck, Tübingen, Germany
Washington D.C. Historical Society