Does anyone know of a compilation/single volume version containing all 3 of the Greensky books by Zilpha Keatley Snyder? The books are:
Below the Root (1975)
And All Between (1976)
Until the Celebration (1977)

I desperately want to find these books as I was an addict of the Commodore 64 game Below the Root as a kid (released by Wyndham Classics games).