Yesterday, August 30, 2004, Yoko Ono placed a full-page advertisement
in the New York Times for peace.  Was this ad placed in any other
papers or magagzines?

Hi, tdurst,
I'm not a GA Researcher and this is not an answer for your question.
What I have to tell you is that I tried to get information on any
other newspaper that have published Yoko's ad, but on the internet I
could only find news about New York Times' ad.
My feeling is that it was published only in NY, probably because it
was the day of the begining of Republican convention.
luntes