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Annual Report 1857. No. 2 (A bis) Sketch A Shewing the progress of the Survey inSection No. 1 From 1844 to 1857. Sub-sketch Showing the Reconnaissance ofTriangulation East of Penobscot Bay Maine. Sub-sketch Showing the position ofDavis' Shoal Discovered by the U.S. Coast Survey in 1846 (Image credit: United States Coast Survey Annual Report 1857)