With some of these, I could identify the source cover immediately, some took a little work, and one I just couldn't nail down:
Crisis on Infinite Earths #7
Daredevil #184
Madame Xanadu Special #1
House of Secrets #92
Transmetropolitan #1
Action Comics #1
Swamp Thing (1972) #9
Saga #1
Deadly Class #1
Tomb of Dracula #1
Gray Morrow Thing
Adventure Comics #381
Fantastic Four #220
Wonder Woman #1
Love and Rockets (1982) #1
Detective Comics #31
Afterlife With Archie #1
Afterlife With Archie #1
And I have to say...I want all of these comic books, man. I don't know if I want to spend $70 to acquire all of them, though, so the images might have to be enough. But you can bet that I'll be keeping my eye out for Vault Comics when I hit the stands every week.
Speaking of, if you go to the Vault Comics website, there's a Free Firsts pull-down tab (https://vaultcomics.com/free-firsts/) which allows you to have free reads of 13 different comic book first issues. That's pretty damned sweet, ennit?
P.S. Found it. The Gray Morrow Thing is Marvel Preview #3--which presents Blade, the Vampire-Slayer.