The Witness who acts as a host for eerie tales (as opposed to the one who appeared in The Twelve, the one Bishop knows or the one who appeared in the New Universe) currently has the following listing.
WITNESS II
[IDEALC 4/2]
CAC 71/4
[AMYSTERIES 32/3]
CAC 72/2
[M/MC 92/2]
It's missing his debut however - he first appeared in 1948's The Witness, which included three stories about him and one non-Witness text story.
Witness II listing
Moderators: Col_Fury, michel, Arthur, Somebody, StrayLamb