New this week on Archive.org, Four centuries of cat books: a bibliography, 1570-1970 (1972). Only manages to note Cats in Prose and Verse (1948) as containing any Lovecraft items, and that only the short poem “Little Sam Perkins”. No mention of “The Cats of Ulthar” in a cat anthology before 1970. At a guess, perhaps Derleth did not allow it to be anthologised?