Shewing the three posts that His Majesty's troops have kept and fortified with buildings therein for guard rooms, Boston, 3th. [sic] Decr. 1775. To His Excellency Major General Howe, Commander in Chief of His Majesty's forces, &c. John Montresor, commandg. engrs. Montresor, John, 1736-1799. CREATED/PUBLISHED [1775] NOTES Scale ca. 1:4,860. Manuscript, pen-and-ink and watercolor. Relief shown by hachures and shading. Dedication is in different ink from drafting of map. Includes index to major fortifications.