Three Contributions to the Theory of Sex was a book written by the psychologist Sigmund Freud in the early 20th century.
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, referred to the book as "an old companion". (TNG: "The Big Goodbye")
The pages seen in the episode were from the mystery novel
Dangerous Ground by author Frances Sil Wickware. This novel was published in 1946. Information on this story was from page 37.
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