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[[envelope]] PAYMENT OF POSTAGE [[5300?]] CIVIL AERONAUTICS AUTHORITY|PAYMENT OF POSTAGE. WASHINGTON OFFICIAL BUSINESS SOMERSET HILLS AIRPORT, FOR MANAGER, % STANDARD FLYING SERVICE, INC., AIR-6 BASKING RIDGE, N. J. [[circular postal stamp]] WASHINGTON, D.C. 8 MAY 13 8-PM 1940 [[/circular postal stamp]]