See DC Special Series #12 for main title entry.
Launched as part of the DC Explosion, DC Special Series was an anthology that focused on a different character every month. It would survive the following Implosion, lasting until the 1981 #27 - Batman vs. The Incredible Hulk - a crossover between DC & Marvel.
The Secrets of Haunted House Special was a One-Shot that came out as #12 of DC Special Series.
I have decided to list this One-Shot under the DC Special Series banner for ease of reference.
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Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.