A very helpful summary! It's clearly stated where each spell comes from, allowing one to easily find a story in which the spell is used. It's not a complete list, though. For example, there is no mention of Ibn-Ghazi powder (the thing dr. Armitage uses to make the Dunwich Horror visible) or anything mentioned in "The dreams in the witch-house". Overall, it's helpful, i.e. for Cthulhu Dark sessions.