1972. 2013-04-15T20:24:57Z. 2013-04-15T20:24:57Z. Ryder, Robert B. U.S. Geological Survey. English. Public. Connecticut and Hartford Region.
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2. Contour map of the bedrock surface, Hartford North quadrangle, Connecticut [cartographic material]
1972. 2013-04-12T18:42:30Z. 2013-04-18T14:13:45Z. Ryder, Robert B. U.S. Geological Survey. English. Public. Connecticut and Hartford Region.
