File:Engineering Centennial 3c 1952 issue U.S. stamp.jpg
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![File:Engineering Centennial 3c 1952 issue U.S. stamp.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Engineering_Centennial_3c_1952_issue_U.S._stamp.jpg/800px-Engineering_Centennial_3c_1952_issue_U.S._stamp.jpg?20160307180316)
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