Map of Washington Air Defence Zone 1942. Compiled by the US Coast and Geodetic Survey under the direction of Colbert, November 5th 1942. On paper size 89 by 61 cm. Scale approximately 8 miles to the inch. Full title Sectional Aeronautical Chart Sheet T-9. A key provides information on features including lookout towers, army, navy or marine corps fields, commercial airports, seaplane bases and anchorages, beacons, radio stations, direction finder stations, plus various types of roads, railroads and settlements etc. Marked restricted and presumably produced as part of US home defence plans. Lines of vital defence areas are printed over the map and prohibited and danger areas are clearly shown. Includes Philadelphia and the coast from Lavalette south to Chincoteague Bay. Has been folded.