The "A Guide Book of United States Coins by R. S. Yeoman 21st Edition 1968" is a comprehensive reference book focusing on coins minted in the United States. Written by R. S. Yeoman, this 21st edition provides detailed information and illustrations on various coins, conveniently serving as a valuable resource for coin collectors or enthusiasts interested in American numismatics. With a focus on United States coins, this guide book offers a comprehensive look at the history, design, and value of different coins from the country's past.