$a Okkultismus und Spiritismus und ihre weltanschaulichen Folgerungen / Richard Baerwald. - Berlin, 1926.
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$a DNB online
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$a LCA online
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$a en.wikipedia, 21.02.14 $b (German academic psychologist, in Berlin. Towards the end of his life he became interested in parapsychology and occultism) $u http://en.wikipedia.org/wiki/Richard_Baerwald