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1989. Geological Survey (U.S.). This layer is a digital raster graphic of the 30 x 60 Minute USGS topographic map of the Boston, Massachusetts quadrangle, 1989. Scale 1:100,000. I... United States Geological Survey.
1887. Harvard Map Collection, Harvard College Library. This layer is a digital raster graphic of the historic 15-minute USGS topographic map of the Fitchburg, Massachusetts quadrangle. The survey date (...
1988. Geological Survey (U.S.). This layer is a digital raster graphic of the 7.5 x 15 Minute USGS topographic map of the Fitchburg, Massachusetts quadrangle, 1988. Scale 1:25,000... United States Geological Survey.
1988. Geological Survey (U.S.). This layer is a digital raster graphic of the 30 x 60 Minute USGS topographic map of the Lowell, Massachusetts quadrangle, 1988. Scale 1:100,000. I... United States Geological Survey.
1916. United States Geological Survey. A scanned USGS 1:62500 topographic map. United States Geological Survey.
1927. Aero Service Corporation. This is a scanned Aerial photograph of the Princeton Area taken between 1927and 1929. Aero Service Corporation.
1957. Aero Service Corporation. This is a scanned Aerial photograph of the Princeton Area taken in 1957. Aero Service Corporation.
1963. Aero Service Corporation. This is a scanned Aerial photograph of the Princeton Area taken in 1963. Aero Service Corporation.
1947. Aero Service Corporation. This is a scanned Aerial photograph of the Princeton Area taken in 1947. Aero Service Corporation.
1920. Aero Service Corporation. This is a scanned Aerial photograph of the Princeton Area taken in the 1920's. Aero Service Corporation.