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Merrimac Canal and mills NYPL bGF B. en Merrimac Canal and mills nypl org Scan by NYPL Merrimac Canal and mills American stereoscopic views Lowell Mass The Miriam and Ira Wallach Division of Art Prints and Photographs Photography Collection eabcfaadabc GFB Robert Dennis collection of stereoscopic views deeadeeaa NYPGF repo