The papers span Halliburton's short but adventurous life, from his Lawrenceville School essay, "Disillusioned," through his Princeton University years (Princeton Class of 1921), his years of worldwide travel, lecturing, and writing, to his posthumously-published "autobiography" of letters to his parents (1940). Autograph and/or typescript drafts of seven of his books, The Royal Road to Romance (1925), The Glorious Adventure (1927), New Worlds to Conquer (1929), The Flying Carpet (1932), Seven League Boots (1935), A Book of Marvels (1937), and Second Book of Marvels (1938), are present, as are some short stories, essays, and notes from his school days. There are also passports, publishing contracts, memorabilia, maps, and newspapers clippings. Halliburton's numerous letters to his parents (1919-1939) provide a vivid account of his travels, and they are supplemented by a large quanitity of photographic prints and negatives documenting the locations he visited, many of which were never published in his books. Correspondence of others includes letters from Devil's Island prisoners, with some manuscripts. Also present are Halliburton's research materials for a biography of Rupert Brooke that he never wrote, including his correspondence with Brooke's friends and acquaintances and summaries of interviews he had with them, as well as copies of Brooke's works and correspondence, some clippings, and photographs.