Thoreau surveys the Concord/Carlisle town line and is paid $42 (A Catalog of Thoreau’s Survey at the Concord Free Public Library, 6; Henry David Thoreau papers. Special Collections, Concord (Mass.) Free Public Library).

“H. D. Thoreau, for survey and plan of line between Concord and Carlisle, 42 00” (Concord Mass. Town Reports, 1851-1852:18).