Brevetembleem parachutist (''rigger'') (USA), bestaande uit open parachute waarop ''RIGGER'', en gespreide vleugels naca wartime report Wind tunnel tests of air inlet and outlet openings on a streamline body / by John V. Becker West Point military library : an open-ended reprint series / ed. by Colonel Thomas E. Griess and Jay Luvaas Open wire construction for fixed plant application - USA Voorschrift, Technical Manual, 11-2253 Searchlights : Description, operation, and care of mobile searchlight unit, cadillac chassis and power unit, and 60-inch open type - USA Voorschrift, Technical Regulations, 1180-5
