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New X-Men #115 NM (2001) 1st app. of Teenage Negasonic!
Uncanny X-Men #211 Marvel 1986 (NM-) 1st Full App. of the Marauders!
X-Men #32 VG/FN- 3rd app. of Juggernaut!
X-Men #28 VG (1967) 1st appearance of the Banshee!
X-Men #54 FN+ 1st app. of Alex Summer (Havok)
X-Men #22 VG+ (1966) Manufactured bottom staple only!
Uncanny X-Men #167 Marvel 1982 (NM-) Death of Professor X! CPV!
Uncanny X-Men #248 1989 (NM-) 1st Jim Lee Art on X-Men! NEWSSTAND!
X-Men #60 VG- (1969) 1st app. of Sauron!
X-Men #56 GD+/VG (1969) 1st appearance of the Living Monolith!
X-Men #37 VG- (1967) 1st app. of the Mutant Master!
X-Men #34 VG- (1967) Mole Man & Tyrannus appearance!
X-Men #8 (1964) 1st app. of Unus the Untouchable!RESTORED
X-Men #144 Marvel 1981 (NM-) Cyclops Solo Story! NEWSSTAND
X-Men #138 Marvel 1980 (VF/NM) Cyclops Leaves the X-Men! NEWSSTAND!