| Negretti & Zambra Photographers to the Crystal Palace Company. H. Negretti & Zambra, Opticians, Meterological and Philosophical Instrument Makers n.d. Label, on back of stereocard Jefferson Stereoptics Courtesy of John Saddy (Auction, 27-28 August 2015, # 15-2, Lot 204) LL/60453
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