Original US Army and USAF Field and Depot Maintenance Manual for Teletypewriter Sets AN/FGC-20, AN/FGC-20X, AN/FGC-21 and AN/UCC-4 from June 1959, 226 pages plus pullout schematic diagrams, 5/3 hole punch, measures 8" x 10.25," Good Condition, covers reflect moderate wear, pages clean and tight, binding holding up well.