X-Men Annual #1 VF- (7.5)
X-Men vs. the Avengers cover and story, origin of Professor X
X-Men #142 NM- (9.2)
Future X-Men vs. the Sentinels cover and story by Chris Claremont and John Byrne, death of the X-Men and Wolverine! Days of Future Past storyline concludes
X-Men #64 F/VF (7.0)
1st appearance of Sunfire, X-Men cover and story, Neal Adams cover art
X-Men #56 F/VF (7.0)
Neal Adams art begins, X-Men cover and story, 1st appearance of Havok without costume
X-Men #61 F+ (6.5)
X-Men vs. Sauron cover and story, Neal Adams cover and art!
X-Men #62 F/VF (7.0)
X-Men vs. Ka-Zar in the Savage Land cover and story, Neal Adams cover and art!
X-Men #63 F/VF (7.0)
X-Men vs Magneto cover and story! Neal Adams cover and art
X-Men #108 NM (9.4)
X-Men cover and story by Chris Claremont, John Byrne art begins!
X-Men #111 VF/NM (9.0)
1st appearance of Arcade! X-Men cover and story by Chris Claremont and John Byrne
X-Men #115 VF/NM (9.0)
X-Men vs Sauron cover art and story by John Byrne & Chris Claremont!
X-Men #122 NM+ (9.6)
X_men cover and story, 1st appearance of Mastermind, Chris Claremont and John Byrne
X-Men #128 VF+ (8.5)
X-Men cover and story by Chris Claremont and John Byrne
X-Men #131 VF/NM (9.0)
1st Emma Frost cover, X-Men vs. the White Queen cover and story by Chris Claremont and John Byrne
X-Men #132 NM- (9.2)
X-Men vs. the Hellfire Club cover and story by Chris Claremont and John Byrne
X-Men #134 VF/NM (9.0)
1st Dark Phoenix, X-Men cover and story, Chris Claremont and John Byrne
X-Men #136 VF/NM (9.0)
Classic Death of Dark Phoenix cover by John Byrne, X-Men cover and story
X-Men #137 NM- (9.2)
Death of Phoenix, X-Men cover and story by Chris Claremont and John Byrne