An Accurate Map of His Majesty’s Province of New-Hampshire in New England (Blanchard and Langdon, 1761)

Joseph Blanchard and Samuel Langdon’s map of New Hampshire, dedicated at Portsmouth in October 1761 and engraved in London by Thomas Jefferys: the province and the country around it in the last French war, from Albany and Lake Champlain to Penobscot Bay and north to Quebec and the St. Lawrence. Its notes record the Wabanaki (Abenaki) ways north to Canada as the colonists of the wars knew them: the “Indian carrying Place from Kennebeck into the River Chaudiere”, drawn as a double-pricked line through three ponds; the Chaudière, “drawn agreable to the Accounts which the Indians give of their Travelling to Canada this way”; the river and lakes by which “Lieut. Starks was led Captive by the Indians from Connecticut River to Canada 1752”; and the ways captives were taken up the Black River, and up Wells River and down the French River toward Lake Champlain. It marks St. Francis (Odanak) by Lake St. Peter, notes Norridgewock on the Kennebec as the seat of a Wabanaki people, and records what “is said by the Indians” of a short carrying place between the heads of the Connecticut and the Androscoggin. This copy carries contemporary ink additions — the New Hampshire Grants townships west of the Connecticut and some northern rivers — left as they are; the upper Chaudière, drawn from report too freely to place, is not shown.

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MapAn accurate map of His Majesty's Province of New-Hampshire in New England, taken from actual surveys of all the inhabited part, and from the best information of what is uninhabited, together with the adjacent countries, which exhibits the theatre of this war in that part of the world,
AuthorJoseph Blanchard and Samuel Langdon, 1761
ArchiveLibrary of Congress
RightsPublic domain. Published 1761 — before 1931, so public domain in the United States. Evidence
AccuracyAbout 20 km (RMS 1.9 km at 49 control points). Placed by hand in a map-queue session and approved by a person. If something sits in the wrong place, members can fix it with Fix placement on the map. Most of the sheet holds to about 5 km; the north, drawn from report and hearsay (the Coos country, Memphremagog, the carrying place to the Chaudière), to 10–20 km.
MethodPlaced by hand: a smoothing thin-plate spline through 49 places read from the scan — forts, river mouths and confluences, falls, capes and islands — and matched to their positions today. The settled country is drawn closely: from the Hudson and the Connecticut valley to the coast of Maine half the places are within 4 km. Its graticule (west longitude from London, after Lewis Evans) puts places about half a degree too far west even after allowing for London, so places were used rather than the graticule. The north is drawn from report and is looser — Lake Memphremagog and the St. Francis 7–12 km out, the routes north of the Connecticut 10–30 km. The Kennebec, surveyed up to the carrying place, holds, and the carrying place falls on the Great Carrying Place to the Dead River; beyond it the map runs straight into the lake at the head of the Chaudière, so the upper Chaudière lands 30–60 km east of its course and is masked. See the methodology.
Version1.0.0, updated 2026-10-15
CoversNew Hampshire, Vermont, Maine, Massachusetts, New York

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Changelog

  • 1.0.0 (2026-10-15): First release: placed by hand at 49 places. From the Library of Congress, Geography and Map Division (gm71005420); added for Project Homeland.

Credits

  • From the Library of Congress, Geography and Map Division (gm71005420); added for Project Homeland
  • Georeferencing: Native Routes
  • Scan: Library of Congress

Control points

The full list of control points with residuals is in control-points.geojson. Historic names indexed for search: names.geojson.

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