The "Master Key"
From Author Wars - https://authorwars.com/books/the-master-key-2783261.html
Overview:
- Title: The "Master Key"
- Author: Frank R. Paul
- Year: 1920
- Type: Interior Art
Editions/Publications:
- Unknown. Science and Invention, August 1920 (Unknown, Frank R. Paul, Experimenter Publishing Company, $0.25, 116 pages, bedsheet, MAGAZINE)