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1
Natural gamma aeroradioactivity map of the Denver area, Colorado /
by Popenoe, Peter
Washington, D.C. : U.S. Geological Survey, 1965

Government Document Map
2
Aeromagnetic map of the Southbridge quadrangle, Worcester County, Massachusetts and Windham and Tolland counties, Connecticut /
Washington, D.C. : Department of the Interior, United States Geological Survey, 1968

Government Document Map
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