File:Charles Doolittle Walcott with Workers.jpg
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![File:Charles Doolittle Walcott with Workers.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Charles_Doolittle_Walcott_with_Workers.jpg/800px-Charles_Doolittle_Walcott_with_Workers.jpg?20120505014903)
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