File:NIH Lab in December of 1938 (49170055247).jpg
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![File:NIH Lab in December of 1938 (49170055247).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8b/NIH_Lab_in_December_of_1938_%2849170055247%29.jpg/770px-NIH_Lab_in_December_of_1938_%2849170055247%29.jpg?20200312043754)
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