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21. United States Summits, 2010

1981. United States Geological Survey and Economic and Social Research Institute (Reston, Va.). United States Summits is a point theme representing summits throughout the United States. This dataset is from the 2010 ESRI Data & Maps Collection. ESRI.

22. United States Summits, 2012

1981. United States Geological Survey and Environmental Systems Research Institute (Redlands, Calif.). United States Summits is a point theme representing summits throughout the United States. Esri.