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Continue to ChatInvestigator's Handbook (Call of Cthulhu Roleplaying) https://shop.thedndgeek.co.uk/product/investigators-handbook-call-of-cthulhu-roleplaying/
Investigator's Handbook (Call of Cthulhu Roleplaying) https://shop.thedndgeek.co.uk/product/investigators-handbook-call-of-cthulhu-roleplaying/