1) Sketch A Showing the Progress of the Survey in Section No. 1 from 844 to 1852. Inset of Davis' South Shoal. Chart shows the coast from Maine to Massachusetts with extensive detail of Cape Cod, Martha's Vineyard and Nantucket Island. (22.5 x35") 2) Preliminary Sketch Showing the Positions of Davis's South Shoal and Other Dangers Recently Discovered by the Coast Survey. (19 x 17") Historical pair showing the survey progress and discoveries as well as a nice view of the area around Cape Code and Martha's Vineyard.

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Condition: A

The former with very small fold intersection splits. The latter also with one small fold intersection split and light toning along one fold.