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ROCK SPIRES ARE SCULPTURED BY EROSION AND ARE REDHUED BY THE PRESENCE OF IRON OXIDE NARA .tif Scope and content General notes Local identifier DA Environmental Protection Agency NARAAuthor Norton Boyd Photographer File ROCKSPIRESARESCULPTUREDBYEROSIONANDAREREDHUEDBYTHEPRESENCEOFIRONOXIDENARA tif tif File ROCKSPIRESARESCULPTUREDBYEROSIONANDAREREDHUEDBYTHEPRESENCEOFIRONOXIDENARA