On-sale date from Casper's Ghostland (Harvey, 1959 series) #93 (December 1976). Date confirmed as the publication date reported to the U.S. Copyright Office recorded in the Catalog of Copyright Entries, Third Series, Volume 30, Part 2, Number 2, Periodicals, July-December 1976. Copyright number B157389.
You are Invited to Attend… The Séance at Spectro Castle!
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