| Ben Hains 21. Entrance to Gothic Avenue [Views of Mammoth Cave and vicinity] 1889 (copyright) Stereocard, detail NYPL - New York Public Library Stephen A. Schwarzman Building / Photography Collection, Miriam and Ira D. Wallach Division of Art, Prints and Photographs, Record ID: 654419 LL/42255 `These are pronounced the very best specimens of Subterranean Photography yet produced`, Scientific American
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