Series, issue and Release Dates are below. The books are in core but the release dates are missing. Thx!
Spawn 120. - October 2002
Spawn 121 - December 2002
Spawn: Shadows Of Spawn 1 - November 2005
Spawn: Shadows of Spawn 2 - January 2006
Spawn: Shadows of Spawn 3 - -March 2006