Have been reading debates on several other threads as to whether or not 1975 was predicted as the end or not.
So go to Google News, type in "Jehovah's Witnesses 1975" or something to that effect, then narrow the results to 1970 - 1979.
Actual newspapers will come up with articles about witness predictions of 1975.
From what I see, they did a pretty good job of getting the word out a la Harold Camping (actually I think he did a better job)
Hope this settles the issue for all time.