Within the back issues of "The Cryptogram", the bi-monthly journal of the American Cryptogram Association, are several articles related to the Zodiac ciphers. I’ll try to post them here as I find them.
Here’s one from the Jan-Feb 1989 issue, in the "Computer Column":
An article about the "Vallejo Murders" from the Nov-Dec 1969 issue:
Z340 appears in the Jan-Feb 1970 issue:
Corrections published in the March-April 1970 issue:
A correction published in the May-June 1970 issue:
"The Radian Ciphers" by Gareth Penn appears in the Nov-Dec 1986 issue:
Zodiac book reviews from the Nov-Dec 1987 issue:
In Mar-Apr 1988, a request from a non-member for someone to check his solution claim:
The Jan-Feb 1990 issue had a recap of the 1989 ACA convention in Dallas, TX, including a talk explaining how Gareth Penn "fell short" on most of his cipher work:
A review of "This is the Zodiac Speaking" in the Mar-Apr 2007 issue:
WOW. 
Programs in BASIC. With line numbers. How quaint.
-glurk
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I don’t believe in monsters.
Thanks D! It’s always nice to see bits of history like this. Makes one wonder if Zodiac used to read this stuff.
“…they may be dealing with one or more ersatz Zodiacs–other psychotics eager to get into the act, or perhaps even other murderers eager to lay their crimes at the real Zodiac’s doorstep.“ L.A. Times, 1969
