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Yellowstone photo album 2, page 17 Yellowstone National Park
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Circa 1938
View series 
Publicity photo, sleep study, Kleitman and Richardson Mammoth Cave National Park; National Park Service
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1938-07
Cave, Kleitman and Richardson experiment, publicity photographs Mammoth Cave National Park; National Park Service
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1938-07-2
Yellowstone photo album 2, page 15 Yellowstone National Park
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Circa 1938
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Cave, Kleitman and Richardson sleep study, publicity photographs Mammoth Cave National Park; National Park Service
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1938-07-2
Willis King, Wildlife Technician, ECW, circa 1936 Great Smoky Mountains National Park Original Captions: Wildlife Technician, ECW. King, Willis; IV-P-17912.Wildlife Technician, ECW.King, Willis, IV-P-17912
Circa 1936
Yellowstone photo album 2, page 14 Yellowstone National Park
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Circa 1938
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Yellowstone photo album 2, page 20 Yellowstone National Park
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Circa 1938
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Dr. Kleitman and Mr. Richardson leaving Mammoth Cave after spending 33 days there in the study of sleep, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Dr. Kleitman and Mr. Richardson leaving Mammoth Cave after spending 33 days there in the study of sleep, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Dr. Kleitman and Mr. Richardson leaving Mammoth Cave after spending 33 days there in the study of sleep, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Dr. Kleitman and Mr. Richardson leaving Mammoth Cave after spending 33 days there in the study of sleep, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Yellowstone photo album 2, page 16 Yellowstone National Park
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Circa 1938
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Mrs. Kleitman was present to greet Dr. Kleitman upon his arrival from the cave, a subsequent banquet followed, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Mrs. Kleitman was present to greet Dr. Kleitman upon his arrival from the cave, a subsequent banquet followed, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Mrs. Kleitman was present to greet Dr. Kleitman upon his arrival from the cave, a subsequent banquet followed, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Party entering Mammoth Cave with newsreel cameraman to greet the two scientists, Dr. Kleitman and Mr. Richardson, making study of sleep, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Flares used for lumination in making newsreel of Dr. Kleitman and Mr. Richardson, University of Chicago scientists making a study of sleep in Mammoth Cave, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Upon reaching the surface and the 76 degree temperature, Dr. Kleitman and Mr. Richardson find it necessary to remove part of their clothing they wore in the 54 degrees of the cave, 1938 Mammoth Cave National Park; National Park Service
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1938-07-2
Yellowstone photo album 2, page 21 Yellowstone National Park
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Circa 1938
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