Unknown Fantasy Fiction, June 1941

From Author Wars - https://authorwars.com/publications/unknown-fantasy-fiction-june-1941-61824.html

Overview:

Title: Unknown Fantasy Fiction, June 1941
Author: John W. Campbell, Jr.
Year: 1941
Publisher: Street & Smith Publications, Inc.
Price: $0.20
Pages: 164
Binding: pulp
Type: MAGAZINE
Title Reference: Yesterday Was Monday
Notes: Vol. V No. 1
Additional data from www.unz.org
The subtitle "Fantasy Fiction" only appears on the cover. All interior references give the title as "Street & Smith's Unknown".