Materials relating to Homer Lea, military adviser to Sun Yat-sen and author of The Valor of Ignorance, and to the revolutionary movement in China, ca. 1900-1920 including Correspondence, telegrams, biographies, articles, pamphlets, clippings, writings, photographs, maps, scrapbooks, and memorabilia, as well as writings and correspondence of Homer Lea, Ethel Lea, and J. B. Powers.