Nautical charts. Chesapeake Bay, Cape Henry to Thimble Shoal light, Va., topography by Coast and Geodetic Survey in 1942-44, corrections from aerial photography to 1944, hydrography by Coast and Geodetic Survey to 1946. supplemented by surveys by U. S. Engineers to 1944; no. 481. Scale naut. m.=3.6 in., scale 1:20,000.

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