Annual Report 1860. No.2 (A bis) Sketch A Shewing the progress of the Survey in
Section No. 1 From 1844 to 1860. Sub Sketch Showing the Triangulation East of
Penobscot Bay Maine. Sub-sketch Showing the position of Davis' Shoal
Discovered by the U.S. Coast Surve in 1846. Sub-Sketch Showing the position of
Phelps' Bank and Asia Rip surveyed in 1860.