Earth 616: The Marvel Universe, pt 4

From Onslaught to just before Marvel Knights

X-Men: The Complete Onslaught Epic, Book 1

X-Men: The Complete Onslaught Epic, Book 2

X-Men: The Complete Onslaught Epic, Book 3

X-Men: The Complete Onslaught Epic, Book 4

At the conclusion of Onslaught, many of the non-mutant heroes were shunted off to a parallel universe, which was chronicled in the Heroes Reborn titles.

Heroes Reborn: Iron Man

Heroes Reborn: Avengers

Heroes Reborn: Fantastic Four

Heroes Reborn: Captain America

The four Heroes Reborn titles occur in a separate universe, but in parallel with the main Marvel Universe.

Thunderbolts: Justice Like Lightning

Ka-Zar by Mark Waid & Andy Kubert – Volume 1

X-Men: Zero Tolerance

All three of these volumes occur at the same time as the Heroes Reborn stories

The Return of the Heroes

Captain America: To Serve & Protect

Reprints Captain America vol. 2, #1-7. (January – July 1998).

Thor By Dan Jurgens & John Romita Jr. Vol. 1

Avengers: The Morgan Conquest

Squadron Supreme: Death Of A Universe

Avengers: Supreme Justice

These two volumes reprint some of the same issues, in a story that crosses over with the Squadron Supreme Universe

Captain America: American Nightmare

Reprints Captain America vol. 2, #8-13 (August 1998 – January 1999), Annual 1998.

Avengers Legends, Vol. 1 – Avengers Forever

Avengers: Clear & Present Dangers

Captain America: Red Glare

Reprints Captain America vol. 2, #14-19 (February – July 1999).

Avengers: Ultron Unlimited

Iron Man: Legacy of Doom

The Marvel Universe – Earth 616