Charts. Chesapeake Bay, Va., Cape Henry to Thimble Shoal Light, surveys to 1929, survey by U. S. Engineers to 1929, surveys by Geological Survey; chart 481. Scale 1:20,000.
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Chesapeake Bay, Va., Cape Henry to Thimble Shoal Light, surveys to 1929, survey by U. S. Engineers to 1929, surveys by Geological Survey; chart 481. Scale 1:20,000.
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Charts. Chesapeake Bay, Va., Cape Henry to Thimble Shoal Light, surveys to 1929, survey by U. S. Engineers to 1929, surveys by Geological Survey; chart 481. Scale 1:20,000.