File:Bones of earliest mammals being studied at Smithsonian Institution. Washington, D.C., May 8, 1937.jpg
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![File:Bones of earliest mammals being studied at Smithsonian Institution. Washington, D.C., May 8, 1937.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Bones_of_earliest_mammals_being_studied_at_Smithsonian_Institution._Washington%2C_D.C.%2C_May_8%2C_1937.jpg/751px-Bones_of_earliest_mammals_being_studied_at_Smithsonian_Institution._Washington%2C_D.C.%2C_May_8%2C_1937.jpg?20180228002237)
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