Sixth Column (Part 3 of 3)

From Author Wars - https://authorwars.com/books/sixth-column-part-3-of-3-193131.html

Overview:

Title: Sixth Column (Part 3 of 3)
Author: Anson MacDonald
Year: 1941
Type: Serials

Editions/Publications:

Unknown. Astounding Science-Fiction, March 1941 (Unknown, Anson MacDonald, Street & Smith Publications, Inc., $0.20, 164 pages, pulp, MAGAZINE)