Item 8562 - Treaty of Washington boundary map, 1842 Item 8562 - Treaty of Washington boundary map, 1842 Contributed by Maine Historical Society Item 8562 Zoom 5096px x 4502px - 17.0"w x 15.0"h @ 300dpi | Need a larger size? *Credit line must read: Collections of Maine Historical Society Image Info Map to illustrate the boundary line established by the Treaty of Washington, Aug. 9, 1842, between the United States and New Brunswick, Canada. Show Details