Originally Posted by DrNefario
I was just coming back to suggest that. The Earthsea books by Ursula K Le Guin are also collected as the Earthsea Quartet.
All of these, though, surely suggest that the sequence is more-or-less complete. If you're adding more books, I'd suggest just adding Omnibus Volume 1 to the series title.
Well I was thinking adding the word "First" so "The First Quartet," That work?