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| Keywords: PSM V51 D226 Charles Doolittle Walcott.png Charles Doolittle Walcott http //www archive org/details/popularsciencemo51newy Popular Science Monthly Volume 51 1897 author PD-old Extracted image from book to grayscale cropped whitespace ineuw http //www archive org/details/popularsciencemo51newy Popular Science Monthly Volume 51 Popular Science Monthly illustrations/Volume 51 Geologists from the United States | ||||
