Psychopathia Sexualis
Psychopathia Sexualis (translation: Psychopathy of ) was a 19th century book of case studies of Human sexuality.

In Dangerous Ground, a copy of this book was in the living room of the Wilson house. Doctor John Rawley, a visitor to the house, considered the book as the foremost reference on abnormal psychology. ()

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Earth literature
The Dixon Hill Series
Scientific literature