. Biology in America. Biology. Polar Bears Courtesy of the National Zoological The Cariboo Photo hy Elwin R. Sanborn. Courtesy of the Neio York Zooloyiral KocUty. 1G9. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger

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