Another fun series was DOOMSDAY+1, with some of the first work by then-unknown newcomer John Byrne. I purchased the first issue off the stands in 1975.
It wasn't until I was reading X-MEN in 1980 that I looked through my collection and realized both were illustrated by the same guy.

Reprinted as DOOMSDAY SQUAD by Fantagraphics in 1985 (publishing the previously unrealeased 7th issue for the first time) and reprinted again by ACG in 1998.




Complete series online at:
https://readcomiconline.to/Comic/Doomsday-1-1975/Issue-1?id=153140#2
(issues 7-12 are reprints of issues 1-6)