Correspondence, writings, reports, and orders documenting Mearns's career as an official and historian of the Library of Congress and scholar of Abraham Lincoln. Includes drafts of Mearn's works, The Story up to Now; The Library of Congress, 1800-1946 (1947) and The Lincoln Papers; The Story of the Collection, with Selections to July 4, 1861 (1948). Correspondents include David M. Barkley, David Laurence Chambers, Jonathan Daniels, Charles E. Feinberg, Carl Haverlin, Harry Miller Lydenberg, Archibald MacLeish, Earl Schenck Miers, Ralph Geoffrey Newman, Carl Sandburg, Fred Schwengel, Alfred Whital Stern, Walter Trohan, and Justin G. Turner.