5 issues missing with this cover date from Marvel
February · 1
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The X-Men V1 (1963) #109 Home are the Heroes!Feb 1978Missing
June · 1
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The X-Men V1 (1963) #111 Mindgames!Jun 1978Missing
September · 1
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The X-Men V1 (1963) #113 Showdown!Sep 1978Missing
November · 1
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The X-Men V1 (1963) #115 Visions of Death!Nov 1978Missing
December · 1
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Dec 1978Missing