Papers of the American author of adventure and mystery stories and U.S. Navy historian (1906-1992). Collection includes correspondence, writings, and memorabilia. Correspondence (1926-1992) with editors, publishers, colleagues, fans, and the U.S. Department of the Navy. Writings -- fiction, non-fiction, notebooks, reviews, and scripts -- contains manuscript drafts, manuscripts, and published material, including examples of adventure and mystery stories written for pulp magazines and material relating to the history of the U.S. Navy. Memorabilia comprises financial material, printed material, and scrapbooks. Printed material consists of books owned by Roscoe, clippings about Roscoe or those which contained story ideas, publicity, and reviews. Many of the scrapbooks pertain to his writings on naval history.