Most of the Norton books I have belong to this series. I have a nearly complete collection, except for the following:
The Book of Andre Norton, aka The Many Worlds of Andre Norton, a collection of short stories containing "The Toads of Grimmerdale" [also found in Lore of the Witch World].
Were-Wrath, a very rare book; only 177 copies were published; the story is loosely connected with High Halleck. It was also published in the collection Wizards' Worlds, which I do own.
The collection is organized by cycles and series (Estcarp Cycle, High Halleck Cycle, The Turning, Secrets of Witch World), followed by collections of short stories and other collections.