English: The psychical researcher William McDougall.
Date
Source
Houdini Unmasked Code Message Received by Beatrice Houdini. Compiled by R. G. Pressing. Dale News, Inc. Lily Dale, New York. Published in 1947 by a defunct group, no copyright status.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.