(032502) Koenig, Robert. The Fourth Horseman: One Man's Mission To Wage The Great War In America. New York: Public Affairs, 2006. 1st Edition. Hardcover. 8vo. 349 pages. Fine in Fine DJ. B&W Photographs. The tragedy and mystery of Anton Dilger (1884-1918), a Virginia farm boy, son of a Civil War hero, who became a German spy during World War I and the main proponent of the German biological warfare sabotage program during ISBN: 1586483722 (Dilger, Anton, World War I, Biological Warfare, Spies, Germany)
