Bravo! I can't believe there is someone else in the world who got the same joy from those coverless, bagged comics. I'm sure they were mostly 1975 comics. And they were all Marvels and DCs, but I could be wrong (it's been 40+ years).
I went through all of the "new" 1980s re-bought copies of the bagged 1975 books. (I was smart enough to label each comic as I stored them away.)
And here the Marvels (17 total):
Amazing Spider-Man 143 (4/75)
Avengers 134 (4/75)
Avengers 136 (6/75)
Captain America 184 (4/75)
Conan 49 (4/75)
Fantastic Four 156 (3/75)
Giant-Size Spider-Man 5 (7/75)
Giant-Size Marvel Team-Up 2 (7/75)
Human Torch 4 (3/75)
Human Torch 5 (5/75)
Marvel Double Feature 9 (4/75)
Marvel Tales 58 (4/75)
Night Rider 4 (4/75)
Spidey Super Stories 5 (2/75)
Spidey Super-stories 6 (3/75)
Thor 236 (6/75)
Uncanny Tales 9 (4/75)
And from DC (18 total):
Action 430 (12/73)*
Action 431 (1/74)*
Action 438 (8/74)*
Action 445 (3/75)
Action 446 (4/75)
Batman 261 (3/75)
Batman 262 (4/75)
Justice Inc. 1 (6/75)
Plop 10 (3/75)
Plop 11 (4/75)
Plop 12 (5/75)
Secrets of Haunted House 1 (5/75)
Superman 215 (4/69)*
Superman 239 (7/71)*
Superman 286 (4/75)
Wonder Woman 215 (1/75)*
World's Finest 226 (12/74)*
World's Finest 229 (4/75)
And a couple independent titles:
Valley of the Dinosaurs 1 (Charlton, 1975)
Star Trek 26 (Gold Key, 1975)
Most of the comics are March to July 1975, but we moved away after that, so there could have been more packaged later.
*After reviewing all the above list, I see that there were older DCs in the bags, the oldest being Superman 215, from six years earlier)
Like I said before, there's nothing very valuable here, but priceless to me!