Marvel, 1963 Series
 
The X-Men #1
Issue 1
September 1963
Add/replace cover
The X-Men #1
The X-Men #2
Issue 2
November 1963
Add/replace cover
The X-Men #3
Issue 3
January 1964
Add/replace cover
The X-Men #4
The X-Men #5
The X-Men #6
The X-Men #7
Issue 7
September 1964
Add/replace cover
The X-Men #8
Issue 8
November 1964
Add/replace cover
The X-Men #9
Issue 9
January 1965
Add/replace cover
The X-Men #10
The X-Men #11
The X-Men #12
The X-Men #13
Issue 13
September 1965
Add/replace cover
The X-Men #14
Issue 14
November 1965
Add/replace cover
The X-Men #15
Issue 15
December 1965
Add/replace cover
The X-Men #16
The X-Men #17
Issue 17
February 1966
Add/replace cover
The X-Men #18
The X-Men #19
The X-Men #20
The X-Men #21
The X-Men #22
The X-Men #23
The X-Men #24
Issue 24
September 1966
Add/replace cover
The X-Men #25
The X-Men #26
Issue 26
November 1966
Add/replace cover
The X-Men #27
Issue 27
December 1966
Add/replace cover
The X-Men #28
The X-Men #29
Issue 29
February 1967
Add/replace cover
The X-Men #30
The X-Men #31
The X-Men #32
The X-Men #33
The X-Men #34
The X-Men #35
The X-Men #36
Issue 36
September 1967
Add/replace cover
The X-Men #37
The X-Men #38
Issue 38
November 1967
Add/replace cover
The X-Men #39
Issue 39
December 1967
Add/replace cover
The X-Men #40
The X-Men #41
Issue 41
February 1968
Add/replace cover
The X-Men #42
The X-Men #43
The X-Men #44
The X-Men #45
The X-Men #46
The X-Men #47
The X-Men #48
Issue 48
September 1968
Add/replace cover
The X-Men #49