| John K. Hillers 21 Mouth of the Narrows (Looking Down) [Views on the Rio Virgen] n.d. Stereocard, detail Jefferson Stereoptics Courtesy of John Saddy (Auction, Tues. May 23rd & Thurs. May 25th, 2006, # 06-2, Lot 217) LL/11739 Powell Expedition.
Note the camera on the tripod.
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