Harvey#1
Flash Gordon
#1
Oct 1950
Catalog data from the Grand Comics Database is licensed CC BY-SA 4.0 and was normalized by The Collector. Cover images belong to their publishers.
#3
Feb 1951
Who made the most issues of this run, with the issues they span.
A fifth issue was prepared, and it is thought that it may have been sent to subscribers as other Harvey titles were, but as of yet there is no confirmation of this. See: http://docs.comics.org/wiki/Non_Qualifying#Flash_Gordon_5
From the Grand Comics Database.