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Map showing the United States of America : Air routes in the U.S.A. shown in blue.
14344.060
2024
Map showing the United States of America : Air routes in the U.S.A. shown in blue. O.R. 303. Ordnance Survey, 1926. Printed at the War Office, 1926.
1926
Air Ministry; Great Britain. War Office; Great Britain. Ordnance Survey
40 × 27 cm
1 : 13000000