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Northrop at Fifty, 1989 calendar, color and black & white photos, history:
$3.90
Color photos (plus many black and white pictures, text)January: P-61 Black WidowFebruary: Precision Gyro ProductionMarch: 747 ProductionApril: F-5 Tiger II with T-38 TalonMay: MX Peacekeeper Inertial Measurement UnitsJune: F/A-18 Hornet Strike FighterJuly: N-1M \"Jeep\" Flying WingAugust: BQM-74C Unmanned Aeronautical VehicleSeptember: YB-49 Flying WingOctober:Mast Mounted Sight November:USAF/Northrop B-2December: Electronic Countermeasures Testing