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Coal formation [?], Manitou Grand Caverns. - Sterescope Card, Colorado

Coal formation [?], Manitou Grand Caverns. - Sterescope Card, Colorado

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

Coal formation [?], Manitou Grand Caverns. - Sterescope Card, Colorado

Coal formation [?], Manitou Grand Caverns. - Sterescope Card, Colorado

Picryl description: Public domain image from Robert Dennis collection of stereoscopic prints, free to use, no copyright restrictions.

Coal formation [?], Manitou Grand Caverns. - Sterescope Card, Colorado

Coal formation [?], Manitou Grand Caverns. - Sterescope Card, Colorado

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

Coal formation [?], Manitou Grand Caverns. - Sterescope Card, Colorado

Coal formation [?], Manitou Grand Caverns. - Sterescope Card, Colorado

Picryl description: Public domain image from Robert Dennis collection of stereoscopic prints, free to use, no copyright restrictions.