I was looking up Wolverine's first appearances at the Marvel Chronology Project due to the fact that i'm adding Hulk #182 to my timeline project and i wanted to check something. And it just struck me how much stuff there is in Wolverine's pre-first appearance backstory (get ready to scroll):

W:E 4 (9 - 13)-FB
O 1
W:O 33 (8)-FB
O 2
O 3
O 4
O 5
O 6
W:O 15 (7:1)-FB
M/CP 93-FB
M/CP 94
M/CP 95
M/CP 96
M/CP 97
M/CP 98-FB
W:O 33 (5:4 - 5:5)-FB
W:O 15 (8 - 10)-FB (1912)
W:O 12 (10 - 11)-FB
W:O 15 (13:1)-FB
W:O 17 (5 - 8)-FB
[W3 57-FB]
[W3 58-FB]
[W3 59 (1 - 5:2)-FB]
[W3 60-FB]
[W3 62 (1 - 3)-FB (1921)]
[W3 62 (17 - 18)-FB]
[W3 63 (1 - 5)-FB]
[W3 63 (17 - 18)-FB]
[W3 64 (1 - 3)-FB]
[W3 64 (18 - 20)-FB]
[W3 65 (1 - 3)-FB]
[W3 65 (14 - 18)-FB]
W2 113-FB
W:AIM
M/CP 154-FB
W2 126 (8)-FB
[W3 52-FB]
[W3 53-FB]
W2 5-FB
UX 257-FB
BLADE8 5-FB
X:TF 2
X:TF 3
L:PW (1 - 9)
W:O 17 (9)-FB
W:O 9-FB
W:O 17 (1 - 2)-FB
W2 106-FB
UX 268 (1 - 5)-FB
UX 268 (9 - 11:5)-FB
W:O 16 (6:4 - 7:4)-FB
UX 268 (11:6 - 11:7)-FB
W:O 16 (8:5)-FB
UX 268 (14)-FB
W:O 16 (10 - 12)-FB
UX 268 (15)-FB
W:O 16 (14 - 15)-FB
UX 268 (17)-FB
W:O 16 (16:1 - 16:3)-FB
UX 268 (20:1 - 20:4)-FB
W:O 16 (16:4)-FB
UX 268 (20:5 - 21:?)-FB
W:O 16 (17 - 19)-FB
UX 268 (22)-FB
W:O 16 (21)
W:O 17 (11 - 16)-FB
W:O 17 (17:5 - 22)-FB
W:O 18 (7:2 - 7:3)-FB
W:O 18 (1 - 6)-FB
W:O 18 (7:4 - 22)-FB
W:O 19-FB
W:O 20-FB
W3 32
[W3 54]
I M/:MMH 1-FB (1943)
W:O 26-FB (1943)
W2 34 (8:2 - 8:3)-FB (06/06/44)
W2 78-FB
[L 1-FB]
[L 2-FB]
[L 3-FB]
W2 103-FB
W2 169-FB
W3 40 (2 - 6)-FB
L:PW (10 - 49)
W3 40 (7 - 14)-FB
W3 40 (16 - 18)-FB
W:O 35-FB
W3 38 (11 -13)-FB
W3 40 (19:6 - 20:2)-FB
W3 38 (14 - 18)-FB
W2 65-FB
W2 47-FB
[W3 50 (15 - 16)-FB]
W:O 5 (11)-FB
[W3 50 (17)-FB]
W:O 5 (12:1)-FB
[W3 50 (18:1)-FB]
W:O 5 (12:2 - 12:3)-FB
[W3 50 (18:2 - 19:?)-FB]
W:O 5 (12:4)-FB
UX 213-FB
W:O 5 (12:5)-FB
W:O 5 (9)-FB
W:O 5 (13 - 15:1)-FB
W:O 3 (3:6)-FB
W:O 3 (12 - 17)-FB
W2 61 (12:4 - 14:?)-FB
W:O 2 (5 - 7)-FB
W:O 2 (12 - 17)-FB
W2 68-FB
W2 61 (8)-FB
W2 9-FB-BTS
W:O 6-FB
W:O 7-FB
X 5 (10:1 - 10:3)-FB
W:O 8 (16:1 - 16:4)-FB
X 7 (3:2 - 3:5)-FB
W:O 8 (17:2 - 19:?)-FB
X 5 (18 - 19:3)-FB
W:O 8 (20:3 - 20:4)-FB
X 6 (5 - 6)-FB
X 7 (6)-FB
W2 60-FB
W2 61 (9:4 - 10:4)-FB
X 6 (14)-FB
GSX 4-FB
UX 228-FB
UTSM -1
M/CP 72
WX2 23 (5 - 8)
M/CP 73 (1 - 2)-FB
W2 48 (8 - 9)-FB
M/CP 73 (3 - 4)-FB
M/CP 73 (1 - 2)
W:E 1 (15)-FB-OP
M/CP 73 (3 - 8:8)
M/CP 74-FB
W:E 3 (4:1)-FB
M/CP 74
M/CP 75-FB
M/CP 75
M/CP 76
W:E 3 (8 - 9)-FB
W:E 4 (6)-FB-BTS
M/CP 77
M/CP 78 (1 -3)
X 130-FB
M/CP 78 (4 - 8)
W2 49 (17 - 18)-FB
W2 63-FB
M/CP 79 (1 - 6:3)
WX2 24-FB
WX2 25-FB
M/CP 79 (6:4 - 8:4)
M/CP 80 (1 - 3:2)
W2 49 (2 - 4)-FB
M/CP 80 (3:3 - 5:3)
W2 48 (11 - 12:2)-FB
M/CP 80 (5:4 - 6:1)
W2 48 (12:3 - 12:6)-FB
M/CP 80 (6:2 - 7:2)
W2 48 (13)-FB
M/CP 80 (7:3 - 8:5)
M/CP 81
M/CP 82
M/CP 83
M/CP 84 (1 - 19:5)
W3 14-FB
X-23 1
W2 166-FB
M/CP 84 (20 - 24)
W2 34 (5:3)-FB
W2 34 (18:4 - 18:4)-FB
W2 34 (5:4 - 5:5)-FB
AF 33 (14:1 - 14:2)-FB
AF2 -1 (9:4 - 9:5)-FB
AF 33 (14:3 - 19:4)-FB
AF2 -1 (11)-FB
AF 3/2
AF2 -1 (12 - 21)-FB
AF2 -1
AF 34-FB
W2 -1-FB
AF 43-FB
W2 -1
FURY 1-FB
UX 147-FB
UX 140-FB
AF 52 (7:4 - 9:5)-FB
AF 53-FB
W/C
W:BR-FB
W/NF-FB
BFF:BGL 1
BFF:BGL 2
BFF:BGL 3
L:SS
AF SPECIAL
AF 127/2-FB
W2 119-FB
W2 120-FB
W2 121-FB
W2 126-FB
W '97-FB
W2 144-FB
W:O 28 (8 - 10)-FB
{H2 180}

Remember when having a mysterious past was part of this guy's appeal? They've mined that to death and beyond. I imagine we could pretty much find out what he had for dinner every day of the week from his birth to the first time he fought the Hulk by going through those issues.

The truly scary thing is that some stories published over the past few years haven't been added to the MCP yet. In other words, the list isn't even complete.