On ploughing through the Tolkien fan-journal Mallorn, from #53-64 (current) I discovered that January 1934 was the likely date when C.S. Lewis (the Narnia books, and he was also the midwife for The Lord of the Rings) started paying regular attention to American pulp magazines. This appears to mean Astounding magazine, which would mean that he read the magazine’s chopped-about versions of Lovecraft’s “At the Mountains of Madness” and “The Shadow Out of Time”. He may also have read Lovecraft in better form in at least one British book collection, but we can’t be sure. The problem being that his books became jumbled up with those of his SF-loving live-in girlfriend.