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Yellowstone photo album 2, page 17 Yellowstone National Park
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
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
Yellowstone photo album 2, page 20 Yellowstone National Park
Yellowstone photo album 2, page 16 Yellowstone National Park
Yellowstone photo album 2, page 21 Yellowstone National Park

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