File:Laboratory. Beltsville, Maryland; 1935.jpg
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![File:Laboratory. Beltsville, Maryland; 1935.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Laboratory._Beltsville%2C_Maryland%3B_1935.jpg/748px-Laboratory._Beltsville%2C_Maryland%3B_1935.jpg?20190723020638)
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