TM 11-5820-680-12 Department of the Army Technical Manual for Operator and Organizational Maintenance Manual Including Repair Parts List, Recorder-Processor-Viewers Radar Mapping for RO-0-166/UP, A, B, C, D, and E. October 1966, Approx. 60 pages, measures 8" x 10.25." Good used condition - covers show moderate signs of aging and wear, pages clean and tight, binding holding up well.