Books about Parapsychology -- Investigation
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Mysterious Psychic Forces
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Metapsychical Phenomena: Methods and Observations
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From India to the planet Mars: A study of a case of somnambulism with glossolalia
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Telepathy and the Subliminal Self
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Patience Worth: A Psychic Mystery
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Telepathy, Genuine and Fraudulent
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Les Phénomènes Psychiques Occultes: État Actuel de la Question (French)
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Preliminary Report of the Commission Appointed by the University of Pennsylvania to Investigate Modern Spiritualism