Call of Cthulhu, by Chaosium Inc., is a role-playing game based on the writings of H.P. Lovecraft and other authors writing using the Lovecraft Mythos.

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Which Call of Cthulhu books do I need to get started?

I'd like to get into Call of Cthulhu. Which books do I need? I have a limited budget, so I'd prefer to get as few as possible. Specifically, tell me: How useful will the core book be on its own? ...
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What are the changes between editions?

What changes are there between each edition so that I can update earlier edition modules more easily? I have many modules for Call of Cthulhu that I have picked up over the years but I only own 3rd ...