The issue of Blake's literary gothicism has been barely explored and remains a tantalizing but frustrating topic. Most essays dealing with Blake and the Gothic rightly focus on his interest in Gothic art and achitecture; see for example Roger Easson's "Blake and the Gothic," in Blake in His Time, ed. Essick and Pearce (1978): 145-54. J. Randonis in "Blakes' Transformation of the Gothic Tradition" does deal with the literary tradition, in fact, makes large claims of Blake's transforming the gothic, but does so without any demonstration of Blake's knowledge of specific gothic titles. And there's the rub: despite what seem some uncanny parallels between Blake's mythic plotting and Gothic narrative and despite the fact a work like The Four Zoas was written during the pinnacle of the Gothic revival, it is hard to determine just what works he knew. Plus there are, of course, other sources for his gothic-seeming (at times) imagery: Fuseli's paintings, his familarity with Blair and Young (the "graveyard school") and others. I'm hopeful that the issue receives some helpful discussion from users of and contributers to this list. So far, I've only tracked down one fascinating, little detail.