This is a lot of Trade Paper Backs that contain key stories. Books included are:

Crisis on Infinite Earth's (George Perez) 2000

The Dark Knight Returns (Frank Miller) 1996

Kingdom Come (Alex Ross) 1997

Green Lantern: Emerald Dawn (Keith Giffen) 1991

Plastic Man Hardcover DC Archive Editions vol 4 (Jack Cole) 2003

Green Arrow: Quiver (Kevin Smith) 2002

Superman: The Sunday Classics 1998

Photos of ISBN in the images.