Issues #1-5 were published by St. John.
Issue #6 is considered to be "Harvey Comic Hits" #61
Series continues as "The Friendly Ghost, Casper" (Harvey, 1958) with numbering restarting at #1
— Description from Comic Vine community (comicvine.gamespot.com · https://comicvine.gamespot.com/casper-the-friendly-ghost/4050-29901/).
