Moon of Three Rings hardcover
I managed to find this one, and I'm really geeked about it. It was one of the first Norton books I discovered as a kid at my local library, and I read and re-read this actual copy many times.
Updates Archive October 2008
Hardcover editions & Witch World
Added hardcover editions of The Jargoon Pard and Gryphon's Eyrie, as well as an older paperback edition of Witch World, ca. 1967.