Helen, over a number of years before her death in 2005 Andre Norton completed some of her of old series with collaborators.

Some of her old books were re-issued in omnibus volumes, sometimes with the new titles which were added to the series.

I decided which series I wanted, & ended up buying quite a few books, old & new, & now have a tall pile of unwanted books to sell, one day, maybe. Some of these old books have much more interesting covers than the new ones, but I can't keep them as the are piled up beside my sewing machine & take up room.

Andre Norton website

Fantastic Fiction for a list of all her books

Are you aware that Earthsea has been continued? It now has 5 volumes & a set of short stories.

I must re-read Once & Future king again - one day.

sandra