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This map of Boston and Charlestown was made in November 1775 by a British officer (possibly S. Biggs) and shows major geographic landmarks and man-made fortifications in the Boston area. Many of the entrenchments, redoubts, and fortified structures are labeled with reference numbers: "1) Charlestown & entrenchments on the heights. 2) The Rebels Redoubt & Entrencht [of] 17th June sine demolished. 3)The difft Lines & Works of the Rebels. 4. Our works." Also included on the map are two lists showing distances in yards between Boston and various points, as well as from Mount Pisgah, near Winter Hill in Somerville, to various points.