Bedrock geologic map of the Montpelier and Barre West quadrangles, Washington and Orange counties, Vermont

অনুযায়ী Walsh, Gregory J.
[Reston, Va.] : U.S. Dept., of the Interior, U.S. Geological Survey, 2010

Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts

অনুযায়ী Walsh, Gregory J.
[Reston, Va.] : U.S. Geological Survey, 2011