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[chart] DIRECTING OFFICE HEAVIER THAN AIR 1ST WING PURSUIT | 2ND WING BOMBARDMENT | 3RD WING OBSERVATION | SCHOOLS HEAVIER THAN AIR | AIRPORTS AND AERIAL ROUTES ITALIAN HEAVIER THAN AIR ORGANIZATION PREPARED UNDER DIRECTION BRIG. GEN. WM. MITCHELL Lt. Clayton Bissell | Jan.27,1922.