I'm trying to identify the issues where Deathbird, Wolverine, and the Hulk were Horsemen of Apocalypse. If anyone could assit with this information, I would appreciate it.

As far as I know, they were not horsemen at the same time. When Wolvie became Death and Deathbird was War, Caliban was Pestilence and Ahab was Hunger. Wolvie, in his very first mission as Death, even fought against the Hulk.

Yeah, I know that they weren't Horsemen at the same time. I just need the issues or storylines in which they became Horsemen.

The Hulk was War for The Incredible Hulk 456 and 457.

In the second series (that I know of) with the title of Astonishing X-Men which was a three part limited series which focused on Wolverine being the new death. It came from the late 90s, don't have a specific date though.