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Annual Report 1860. No.2 (A bis) Sketch A Shewing the progress of the Survey inSection No. 1 From 1844 to 1860. Sub Sketch Showing the Triangulation East ofPenobscot Bay Maine. Sub-sketch Showing the position of Davis' ShoalDiscovered by the U.S. Coast Surve in 1846. Sub-Sketch Showing the position ofPhelps' Bank and Asia Rip surveyed in 1860. (Image credit: United States Coast Survey Annual Report 1860)