Zap Comix has been published since 1968.
Notes on verification
Multiple independent sources (Wikipedia, Grand Comics Database, Fantagraphics) confirm 1968 as the start of publication, with minor nuance about copyright vs. release dates that doesn't affect the core claim. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.525 clusters=2 claim_tier=everyday | kind=empirical eligibility=high]
Sources
- Robert Crumb – Der Schmutzfink (seed:culture_and_philosophy)
- https://www.comics.org/issue/21551/ (corroboration)
- https://www.fantagraphics.com/collections/zap-comix (corroboration)