Cave, scientists engaged in various posed activities inside the cave, 1938
Mammoth Cave National Park; National Park Service
Cave, scientists engaged in various posed activities inside the cave, 1938
Mammoth Cave National Park; National Park Service
Cave, going through their daily routine of washing, Dr. Kleitman pours water for Mr. Richardson, 1938
Mammoth Cave National Park; National Park Service
Cave, Dr. Kleitman reads a register while Mr.Richardson sleeps in their study of sleep, 1938
Mammoth Cave National Park; National Park Service
Cave, Courier Journal photographer making picture of scientists. Mr. Joseph Mader, Publicity Director, standing at right, 1938
Mammoth Cave National Park; National Park Service
Cave, the two scientists, Dr. Kleitman and Mr. Richardson, Chicago University physiologists, have dinners in their underground repose, 1938.
Mammoth Cave National Park; National Park Service
Cave, the two scientists from University of Chicago, Bruce Richardson at left and Dr. Kleitman at right at study, 1938
Mammoth Cave National Park; National Park Service
Cave, the two scientists from University of Chicago, Bruce Richardson at left and Dr. Kleitman at right at study, 1938
Mammoth Cave National Park; National Park Service
Cave, scientists at study table in their subterranean suite in which they spent 35 days in scientific study of sleep and evironment factors, 1938
Mammoth Cave National Park; National Park Service
Cave, a waiter from hotel bringing lunch and mail to scientists Dr. Nathaniel Kleitman, left, and Bruce Richardson, undergoing experiments in sleep in Mammoth Cave, 1938
Mammoth Cave National Park; National Park Service
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