Ocker, William C. Major US Air Corps and Carl J. Crane, 1st Lt US Air Corps. Blind Flight in Theory and Practice. San Antonio, Texas; The Naylor Company; 1932. First edition, third printing. Sm 4to (6x9"), 200 pages, photo and drawing illus, green cloth, no dj. A classic and now rare early work on instrument flight. Fair to good; head and foot of spine frayed; text block very good.