CoasterjunkieX

I can at least help with some of the handouts. They're linked on the product pages for The Two-Headed Serpent and Doors to Darkness. Two-Headed Serpent: https://www.chaosium.com/content/FreePDFs/CoC/CHA23125 - The Two-Headed Serpent/CHA23125 - The Two-Headed Serpent Keeper Resource Pack.pdf Pulp Cthulhu Sheets are here: https://www.chaosium.com/cthulhu-character-sheets/ Doors to Darkness Handouts: https://www.chaosium.com/content/FreePDFs/CoC/CHA23148 - Doors to Darkness/CHA23148 - Doors to Darkness Handouts.pdf Doors to Darkness Pre-gens: https://www.chaosium.com/content/FreeP

If you're looking for some extensive list of scenarios/suppliments, I'd recommend these two Yog-Sothoth wiki pages: Scenarios: https://www.yog-sothoth.com/wiki/index.php/CoC:Scenarios Suppliments: https://www.yog-sothoth.com/wiki/index.php/CoC:Supplements Since I came to CoC in 7e, I can't definitively speak to the completeness of these lists, but there is a ton listed on there. The tables can be sorted by year, title, publisher, and setting era. Not everything has descriptions on their respective pages, but checking the category for Scenarios allows you to look at scenarios by tome