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Contour map of the bedrock surface, Ludlow Quadrangle, Massachusetts
Clark J. Londquist
1973, Miscellaneous Field Studies Map 503-A
Contours show the altitude of the bedrock surface.  The position of the contours is based largely on data from wells and test holes supplemented by knowledge of the geologic history of the region.The map show the configuration of the bedrock surface if all unconsolidated earth materials were removed....