:This is an excellent condition, complete ESP CARD SET set developed at Duke University in 1937. This is not a reprinted 1960\'s set with a zip code on the package. Duke\'s Parapsychology Laboratory was founded in 1930 by Drs. J. B. and Louisa Rhine. The Lab was interested in studying “those powers of the human mind that are commonly called hunches, intuition, mind-reading.” They conducted experiments with the Zener cards, named after colleague Dr. Karl Zener, which tested for clairvoyance by recording how many times the subject could guess the design on the card correctly. Published by Whitman Publishing, copyright 1937 by J.B. Rhine
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