Serious literary artists such as T.S. Eliot, James Joyce and Virginia Woolf loom large in most accounts of the literary art of the first half of the 20th century. And yet, working in the shadows cast by these modernists were science fiction, horror and fantasy writers like the "Weird Tales Three" H.P. Lovecraft, Clark Ashton Smith and Robert E. Howard. They did not publish in artistically ambitious magazines like Dial,...