Are there ways for a person to go back and find these items using JW reference materials
Yes, if you know where to look. JWs produce a CD called "Watchtower Library" - the latest version being from 2006. Most JWs have a copy. This CD library includes all issues of the Watchtower magazine from 1975 - 2006 plus other publications.
If you do a search under the topic "1975" you will find references to predictions about 1975. In the 1960s and early 1970s, JWs believed that "Armageddon" would occur by 1975, with Jehovah's Witnesses being the only survivors. Their publications made indirect references to this belief. You can find examples of this on the CD by checking references from Watchtower magazines of 1968 - 1970.
If you do a search under the topic "generation", you will find comments like the following, from Watchtower of 15 May 1984:
Revelation 17:16 indicates that radical political elements within the United Nations (the "scarlet-colored wild beast") will hate the religious harlot and devastate her. Already, powerful atheistic and antireligious elements in the UN have taken steps to stamp out religion within their domain. But more drastic action is expected in the near future when these political elements devastate not only Christendom but also the other great religious systems. Logically, the anti-God forces will also attack Jehovah’s Witnesses who faithfully proclaim God’s Kingdom. This will be tantamount to attacking God himself and will provoke retaliation—God’s war of Armageddon!—Revelation 17:3, 12-16; 16:14-16; Ezekiel 38:10-12, 18-23; Zechariah 2:8.
From a purely human viewpoint, it could appear that these developments could hardly take place before the generation of 1914 disappears from the scene. But fulfillment of all the foretold events affecting the generation of 1914 does not depend on comparatively slow human action. Jehovah’s prophetic word through Christ Jesus is: "This generation [of 1914] will by no means pass away until all things occur." (Luke 21:32) And Jehovah, who is the source of inspired and unfailing prophecy, will bring about the fulfillment of his Son’s words in a relatively short time.—Isaiah 46:9, 10; 55:10, 11.
In other words, JWs at the time, believed that some who were alive in 1914 would still be alive when the United Nations would destroy religion and try to attack JWs, then Jehovah would start Armageddon and the only survivors would be JWs.
This belief was changed in 1995 when it was obvious that the generation of 1914 was dying out.
There are websites such as www.jwfacts.com - this has a section on "Changed Teachings".
Hope this is helpful.