Little Giant Detective Funnies #4

On sale date from the publication date as submitted to the U.S. Copyright Office found in the Catalog of Copyright Entries, Part 2, Periodicals, 1939 (July-September), New Series, Volume 34, Number 3. Class B periodical. Copyright registration number B 425470. No issues #2-3 of this series was submitted for copyright protection per the catalog, confirming they were never produced.