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Keywords: Chemistry 13c 1976 issue U.S. stamp.jpg en Chemistry 13-cent 1976 issue U S stamp 1976-04-06 U S Post Office; http //arago si edu/category_2039085 html National Postal Museum Bureau of Engraving and Printing Designed by Ken Davies other versions PD-USGov Commemorative stamps of the United States US multi-colored stamps Stamps of the United States 1971-1977 1976 stamps of the United States Chemistry on stamps |