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Old mining work at Mongomery Col. Tr NYPL bGF B. en Old mining work at Mongomery Col Tr nypl org Scan by NYPL Old mining work at Mongomery Col Tr Rocky Mountain scenery Denver Colo The Miriam and Ira Wallach Division of Art Prints and Photographs Photography Collection bcabccffdabc GFB Robert Dennis collection of stereoscopic