1 page, 4to, on personal stationery, with original autograph envelope." /> SULLIVAN, Louis H. (1856-1924), <I>Architect</I>. Autograph letter signed ("Louis H. Sullivan") to Horace Traubel (1858-1919), Chicago, 13 August 1912. <I>1 page, 4to, on personal stationery, with original autograph envelope</I>. | Christie's