All 7 books by Spectra
Here's all I've got from Spectra. I've read 3 books.
Spectra

Forward the Foundation
by Isaac Asimov
Spectra, 1994
Spectra, 1994

Snow Crash
by Neal Stephenson
Spectra, 1992
Spectra, 1992

Foundation's Edge
by Isaac Asimov
Spectra, 1991
Spectra, 1991

Prelude To Foundation
by Isaac Asimov
Spectra, 1989
Spectra, 1989

Foundation and Earth
by Isaac Asimov
Spectra, 1986
Spectra, 1986

Second Foundation
by Isaac Asimov
Spectra, 1953
Spectra, 1953

Foundation and Empire
by Isaac Asimov
Spectra, 1952
Spectra, 1952