Surficial geologic map of the Northfield quadrangle, Belknap and Merrimack Counties, New Hampshire / by Daniel J. Tinkham and John A. Brooks, 2003 ; prepared in cooperation with New Hampshire Environmental Services, New Hampshire Geological Survey and United States Geological Survey STATEMAP.
- "Geology mapped in 2003." "Produced by the United States Geological Survey. Controlled by USGS and NOS/NOAA. Compiled from aerial photographs taken 1981. Field checked 1984. Map edited 1987." Relief shown by contours. "Contour interval 20 feet." "43071-D5-TF-024." "GRANIT TILE 123." Includes quadrangle location map and index chart to adjoining 7.5 quadrangle names.
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