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Crystalline rocks of the Potomac river Gorge near Washington, D.C. / by John C. Reed and Janice Jolly.

By: Reed, John C, 1930-.
Contributor(s): Jolly, Janice L.
Material type: materialTypeLabelBookSeries: Geological Survey Professional Paper; 414-H.Publisher: Washington : United States Government Printing Office, 1963Description: 16 p. --.Content type: Texto (visual) Media type: sin mediación Subject(s): Petrología | Rocas | Washington
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