Notes:
The publication date of January 23, 1940, was reported in the U. S. Copyright Office filing in the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 35, 1940, Number 2. Class B Periodical. Copyright number B 452451.
However, a house ad in Action Comics (DC 1938 series) #22 states the issue would be on sale on February 15, 1940.