There is SO MUCH documentation about 1975 from the Society's own publications, it's hard to know where to begin. I gotta run for now, but I found the following in an earlier post. I'm borrowing from a post from Marvin Shilmer, who did the actual research.
The thread is located at http://www.jehovahs-witness.com/forum/thread.asp?id=22408&site=3#281139
*** w68 8/15 499 Why Are You Looking Forward to 1975? ***
30. What may occur before 1975, but what attitude should we take?
30 Are we to assume from this study that the battle of Armageddon will be all over by the autumn of 1975, and the long-looked-for thousand-year reign of Christ will begin by then? Possibly, but we wait to see how closely the seventh thousand-year period of man’s existence coincides with the sabbathlike thousand-year reign of Christ. If these two periods run parallel with each other as to the calendar year, it will not be by mere chance or accident but will be according to Jehovah’s loving and timely purposes. Our chronology, however, which is reasonably accurate (but admittedly not infallible), at the best only points to the autumn of 1975 as the end of 6,000 years of man’s existence on earth. It does not necessarily mean that 1975 marks the end of the first 6,000 years of Jehovah’s seventh creative “day.” Why not? Because after his creation Adam lived some time during the “sixth day,” which unknown amount of time would need to be subtracted from Adam’s 930 years, to determine when the sixth seven-thousand-year period or “day” ended, and how long Adam lived into the “seventh day.” And yet the end of that sixth creative “day” could end within the same Gregorian calendar year of Adam’s creation. It may involve only a difference of weeks or months, not years.
*** km 5/74 3 How Are You Using Your Life? ***
Yes, since the summer of 1973 there have been new peaks in pioneers every month. Now there are 20,394 regular and special pioneers in the United States, an all-time peak. That is 5,190 more than there were in February 1973! A 34-percent increase! Does that not warm our hearts? Reports are heard of brothers selling their homes and property and planning to finish out the rest of their days in this old system in the pioneer service. Certainly this is a fine way to spend the short time remaining before the wicked world’s end.—1 John 2:17.
*** w68 8/15 501 Why Are You Looking Forward to 1975? ***
36 Even if one cannot see beyond 1975, is this any reason to be less active? The apostles could not see even this far; they knew nothing about 1975. All they could see was a short time ahead in which to finish the work assigned to them. (1 Pet. 4:7) Hence, there was a ring of alarm and a cry of urgency in all their writings. (Acts 20:20; 2 Tim. 4:2) And rightly so. If they had delayed or dillydallied and had been complacent with the idea the end was some thousands of years off they would never have finished running the race set before them. No, they ran hard and they ran fast, and they won! It was a life or death matter with them.—1 Cor. 9:24; 2 Tim. 4:7; Heb. 12:1.
There's a lot more, but unfortunately I have to take my daughter home right now. See you!
-J.R., member, UADNA-MN
(Unseen Apostate Directorate of North America - Minnesota division)
This post was not evaluated by any mental health professionals.
Any opinions expressed are those of a fuzzy, cuddly rodent.