| Underwood & Underwood 6147 In the mountain's heart - running out copper ore. Wilson Mine, Metcalf, Arizona (S268) n.d. Stereocard Jefferson Stereoptics Courtesy of John Saddy (Auction, Tues. May 23rd & Thurs. May 25th, 2006, # 06-2, Lot 212) LL/11735
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