1. Bedrock geologic map of the Hampden quadrangle, Massachusetts and Connecticut [cartographic material] Yale Public content 1977. 2012-06-04T14:27:15Z. 2012-06-13T15:03:33Z. Peper, John D. U.S. Geological Survey. English. Public. Massachusetts, Hampden County, Connecticut, Tolland County, and U.S.