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A large mine with slag heaps. - stereoscopic view, public domain photo...
Colorado stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More
[A large mine with slag heaps.]
Colorado stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More