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X-Men #41 Marvel 1968 (VG+) 1st App of Grotesk! Origin of Cyclops!
X-Men #45 marvel Comics 1968 (FN-) Origin of Iceman!
X-Men #47 Marvel Comics 1968 (FN) Iceman Solo Back-up Story!
X-Men #48 Marvel Comics 1968 (VG/FN) 1st Appearance of Computo!
X-Men #50 Marvel 1968 (VG+) 2nd App of Polaris! Steranko Cover!
X-Men #52 Marvel Comics 1969 (FN-) 1st Full App of Erik The Red!
X-Men #54 Marvel 1969 (FN+) 1st Appearance of Alex Summers (Havok)
X-Men #58 Marvel Comics 1969 (VG+) 1st Appearance of Havok! Neal Adams!