The Club House: Mastermind

From Author Wars - https://authorwars.com/books/the-club-house-mastermind-2283496.html

Overview:

Title: The Club House: Mastermind
Author: r-tRapp
Year: 1950
Type: Short Fiction

Editions/Publications:

Unknown. Amazing Stories Quarterly (Reissue), Summer 1950 (Unknown, r-tRapp, Ziff-Davis, $0.50, pulp, MAGAZINE)