EarthWorks Geospatial Catalog

Surficial geologic map of the Derry quadrangle Rockingham County, New Hampshire / by Gregory D. Gephart, 1985 ; design and drafting of map by Graphics Arts Section, Department of Resources and Economic Development in cooperation with the U.S. Geological Survey-COGEOMAP Program.

Relief shown by contours and spot heights. "Contour interval 10 feet." "Interior--Geological Survey, Reston, Virginia--1978." "Topographic base by U.S. Geological Survey." "Description of map units"--Booklet. Includes location map and list to geologic features.
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