Correspondence with James Cardinal Gibbons, bishops John Ireland, John J. Keane, Denis O'Connell, and John Lancaster Spalding, and others, much of it concerning Americanism; also notes, clippings, pamphlets, drafts, and photographs.

Correspondence and related papers of John Ireland; scrapbooks; and supplementary papers including Denis O'Connell letters. For a more detailed description, see Guide to a Microfilm Edition of The John Ireland Papers by Scott Jessee (St. Paul: Minnesota Historical Society, 1984).