Question: What is the date of birth of Kathryn Kidder's husband?
Sentence (from "Louis K. Anspacher"): He was the author of "Challenge of the Unknown: Exploring the Psychic World", with an introduction by Waldemar Kaempffert, which was published by Allen and Unwin, in the USA in 1947 by Current Books, and in Great Britain in 1952 by Henderson and Spalding.
Relevant evidence: No