This issue has variants.
Reprints X-Men #137 with the original ending where Phoenix (Jean Grey) didn't die as well as additional material.
Cover title is "Phoenix: The Untold Story".
Source for letters credit is The Official Marvel Index to the X-Men (Olshevsky 1988).
Text Piece With Clip Art: Interview with the creators on Why Phoenix Had to Die (or did she?).
Original unused Splash Page for X-Men #138 featuring Cyclops and Jean Grey.