Lot of Three Vintage technical manuals from the original Frontier Airlines that operated between 1950-1986 regarding the Boeing 737 Aircraft.  Included is a Boeing 737-200 Performance manual from the 1960’s with information on aircraft definitions, take off weight, and operational limits, a 1969 Boeing 737 Panel Description Manual with information on panel gauges for electrical, fuel, fire protection, hydraulic, and more, as well as a FrontierBoeing 737 Theory of Weight and Balance Programmed Instruction Manual.  A very interesting lot from a former Frontier Airlines mechanic!