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→Photographic Geology Tours: clean up & uniformity
*[http://3dparks.wr.usgs.gov/3Dcanyons2/pages/fg01.htm Historic Tour]. See imagery from John Wesley Powell's Second Expedition (1871-1872).
*[http://3dparks.wr.usgs.gov/3Dcanyons2/pages/fg01.htm Historic Tour]. See imagery from John Wesley Powell's Second Expedition (1871-1872).
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==References==
==References==
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