File:National Park Service 50th Anniversary 5c 1966 issue U.S. stamp.jpg
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![File:National Park Service 50th Anniversary 5c 1966 issue U.S. stamp.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/23/National_Park_Service_50th_Anniversary_5c_1966_issue_U.S._stamp.jpg/800px-National_Park_Service_50th_Anniversary_5c_1966_issue_U.S._stamp.jpg?20160229064414)
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