Comic Title: Mystery in Space #21
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: Aug/Sep 1954
On Sale Date: June 4, 1954 Copyright Date June 2, 1954
Source: Library of Congress, Periodicals 1954
Until 1958 DC did not report actual on sale dates to the copyright office
The publication dates listed in LoC records are NOT release dates.

Newsstand Date June 4, 1954
Source: Newsdealer Magazine, V9 #4

Frequency: Bi-monthly
Cover Price: $0.10
Page Count: 32
Editor: Julius Schwartz

Title: "Interplanetary Merry-Go-Round"
Pages: 6

Writer: Otto Binder
Artist: Sy Barry

Reprinted In:
From Beyond the Unknown #15 (1972)