Blanchard, Joseph, -1758,  Langdon, Samuel,  and Jefferys, Thomas, -1771.  "An accurate map of His Majesty's province of New-Hampshire in New England."  Map.  1761.  Norman B. Leventhal Map & Education Center,  https://collections.leventhalmap.org/search/commonwealth:0r96fq74n (accessed June 22, 2021).