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X-Men #45 Marvel 1968 (FN+) Cyclops Appearance
X-Men #42 Marvel 1968 (FN-) Death of Professor X
X-Men #41 Marvel 1968 (VG-) 1st Appearance of Grotesk
X-Men #40 Marvel 1968 (VG-) Classic Frankenstein Cover
X-Men #37 Marvel 1967 (VG-) 1st App. of Mutant Master
X-Men #36 Marvel 1967 (VG/FN) 1st App. of Mekano
X-Men #35 Marvel 1967 (VG-) 1st App. Changeling - Spider-Man App.
X-Men #34 Marvel 1967 (FN-) Tyrannus & Mole Man Appearance
X-Men #33 Marvel 1967 (VG) 4th App of Juggernaut
X-Men #32 Marvel 1967 (VG+) 3rd App of Juggernaut
X-Men #31 Marvel 1967 (GD+) 1st App. of Cobalt Man
X-Men #30 Marvel 1967 (VG+) Warlock Appearance
X-Men #27 Marvel 1966 (VG-) Mimic Joins Team
X-Men #26 Marvel 1966 (FN-) El Tigre Appearance
X-Men #26 Marvel 1966 (FN) El Tigre Appearance
X-Men #25 Marvel 1966 (VG-) 1st App. of El Tigre
X-Men #24 Marvel 1966 (GD+) 1st App. of Locust
X-Men #23 Marvel 1966 (GD-) Count Nefaria Appearance
X-Men #22 Marvel 1966 (GD-) Count Nefaria Appearance
X-Men #21 Marvel 1966 (GD) Lucifer Appearance - Cover Detached
X-Men #21 Marvel 1966 (VG-) Lucifer Appearance
X-Men #19 Marvel 1966 (VG+) 1st App. of the Mimic
X-Men #13 Marvel 1965 (F/GD) Several Flaws - See Description
X-Men #9 Marvel 1965 (VG+) 1st Avengers Meeting - 1st App. Lucifer
X-Men #7 Marvel 1964 (VG-) 1st App. Cerebro - 2nd App. of Blob
X-Men #6 Marvel 1964 (GD-) 3rd App. of Scarlet Witch
Journey Into Mystery #112 Marvel 1965 (G/VG) 1st Thor vs Hulk
Strange Tales #126 Marvel 1964 (G/VG) 1st App. of Dormammu & Clea
Tales to Astonish #57 Marvel 1964 (GD/VG) Giant-Man Battles Spider-Man
Avengers #57 Marvel 1968 (VG-/VG) 1st Appearance of the Vision