1971. 2012-03-15T14:51:00Z. 2012-03-27T23:59:25Z. Geological Survey (U.S.). The Survey. English. Public. Connecticut, Litchfield County, and Hartford County.
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1968. 2012-02-15T18:24:43Z. 2012-03-05T17:41:13Z. Geological Survey (U.S.). The Survey. English. Public. Connecticut and Litchfield County.
1970. 2012-03-05T16:48:20Z. 2022-12-08T04:39:10Z. Warren, Charles R., 1913-. U.S. Geological Survey. English. Public. Connecticut, Litchfield County, and Hartford County.
1970. 2012-03-12T13:04:35Z. 2012-03-27T23:58:25Z. Pessl, Fred. U.S. Geological Survey. English. Public. Connecticut, Litchfield County, and New Haven County.