I thought about American paperbacks likely to be available in 1967. I probably began to read JRRT in 1966, but certainly was acquainted with him early in 1967.
OK, I thought: if I were a Tolkien devotee and wanted more high-quality fantasy in paperback, what might I be able to get hold of in that year, without having access to big bookstores staffed by knowledgeable bibliophiles, without getting useful advice from teachers or librarians, but basically by educating myself, by looking at spinner racks in drug stores, food markets, and stationery stores, and at the shelves in thrift stores. What could I find that I would think deserved a place on the same shelf as The Hobbit, The Lord of the Rings, and The Tolkien Reader? I decided on these:
C. S. Lewis’s cosmic trilogy, the single-volume edition of George MacDonald’s Phantastes and Lilith, Haggard’s She, Eddison’s Worm Ouroboros, and Alan Garner’s Weirdstone
The MacDonald volume was a trade paperback, so I might have to be lucky to get that; it wasn't likely to show up in drug stores, etc., and the publisher, Eerdmans, was not widely distributed. The Lewis paperbacks were issued by Macmillan, and though they were mass market size, were made with better paper than mass market softcovers typically were. I don't know if they were likely to show up in the typical paperback outlets. The rest of those books were all available in ordinary mass market softcovers in 1967; the Haggard, Eddison, and Garner would have had the most widespread distribution.
There was quite a bit of sword and sorcery coming into paperback by then, but I don't think those deserve shelf space with Tolkien. I have also indulged my personal evaluation and not included some non-S&S fantasy that was available in mass market paperbacks, and that many people might feel were worthy of a place with Tolkien, such as T. H. White's The Once and Future King and Austin Tappan Wright's utopian fantasy Islandia, which I have never read. Some might also argue for John Myers Myers's Silverlock, which, again, I haven't read.
How about you? What would you choose for a shelf of fantasy books if you were in 1967 and had $10 to spend?