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You searched for: Country United States Remove constraint Country: United States Subject Rock formations Remove constraint Subject: Rock formations

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  • F-45= Down inside the grand canyon of the Yellowstone river  C.W. Cushman
  • F-2= A small terrace at  Mammoth Hot Springs Yellowstone  C.W. Cushman
  • D-42= west bank of Columbia river  from Hwy bridge in Central Washington