1966. 2012-01-03T16:02:10Z. 2012-03-05T17:27:50Z. Simpson, Howard E. U.S. Geological Survey. English. Public. Connecticut and Hartford County.
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1961. 2011-05-06T17:33:20Z. 2012-02-14T23:32:38Z. Simpson, Howard E. The Survey. English. Public. Connecticut, Hartford County, Litchfield County, and New Haven County.
3. Geologic map of the New Britain quadrangle, Connecticut surficial geology / [cartographic material]
1959. 2011-04-28T17:49:47Z. 2012-02-14T23:31:07Z. Simpson, Howard E. The Survey. English. Public. Connecticut and Hartford County.
1968. 2012-02-20T18:24:43Z. 2012-03-06T15:51:51Z. Simpson, Howard E. U.S. Geological Survey. English. Public. Connecticut, Middlesex County, and New Haven County.
