The work that has gone into this book is incredible. It lists over 2620 items of mythos or mythos-related fiction and poetry, from the turn-of-the-century (Bierce, Machen, Blackwood, etc) up until items published in the late nineties. Just the fiction available online runs into the hundreds of titles! I thought I had a fairly large mythos collection (about 300 tales/poems), but the amount of source material actually listed is enormous. Indexed alphabetically by author, and then by original publication date, it also has a cross-reference index, in case you only know the title of a work. Want to know which stories have featured the Mi-Go? Then there's also a large concordance index listing all mythos references and in which items of the bibliography they are mentioned. What else could you want? A list of collections of mythos works? Again, it's here. ESSENTIAL for any Lovecraft enthusiast, this will go down as a landmark in the field of Lovecraftian studies.