The Cthulhu Mythos has been a major interest and hobby of mine since about 1992. I have since published a thesis on Lovecraft’s work and its influence on various subcultures (in German). You can get it at Amazon for an obscenely inflated price, but I would not recommend it. The whole thing is available for free on my original homepage, Sarkomand.de, so go there instead. It also has the benefit that you can use the Google Translate tool, if necessary.