Original vintage Utility Flight Handbook, USAF YC-121F (T.O. 1C-121(Y)F-1).
304 pages, 8.5x11", illus. Good plus; cover page toned and chipped, text has edge soil. Ink annotation on Table of Contents page reads: "Apparently only two C-121's were built with turbo-prop engines. They were Air Force serial numbers 53-8157 and 53-8158 (Lockheed numbers 4161 and 4162)". Surely with only two built and designated YC-121F, this may be the only existing flight manual for this version; thus quite rare.