
The Nashua River corridor serves as the central artery for this part of Middlesex County, where the industrial legacy of Ayer and the residential character of Groton meet. The landscape is defined by a series of prominent glacial hills, including Gibbet Hill and Nonaicoicus Hill, which rise above a complex network of wetlands like Burnt Meadow Swamp and Carmichael Swamp. To the south, the expansive Devens Reserve Forces Tng Area occupies a significant portion of the terrain, reflecting the long military presence in the area.
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1886 · Lowell
USGS Topo · 1:62,500
1886 · Framingham
USGS Topo · 1:62,500
1887 · Marlboro
USGS Topo · 1:62,500
1889 · Marlboro
USGS Topo · 1:62,500
1889 · Framingham
USGS Topo · 1:62,500
1893 · Lowell
USGS Topo · 1:62,500
1893 · Groton
USGS Topo · 1:62,500
1894 · Framingham
USGS Topo · 1:62,500
1896 · Marlboro
USGS Topo · 1:62,500
1898 · Marlboro
USGS Topo · 1:62,500