Conversation so far:
What is Vortex and Ed the Happy Clown?
Vortex Comics publisher Bill Marks picked up Yummy Fur as a regular, initially bimonthly comic book.
When did the comic start?
1986.
When did the comic end?
He brought Ed to an abrupt end in Yummy Fur #18 to turn to autobiography.
Did Brown collaborate with anyone on the comics?
the first Ed collection appeared, collecting the Ed stories from the first twelve issues of Yummy Fur with an introduction by American Splendor writer Harvey Pekar.
Did he work with anyone else?
CANNOTANSWER.

Question: How many comics were published?
Self-contained rewrite: How many Vortex and Ed the Happy Clown were published?