smiddy, i never read any of the publications when I was a witness. they bored me too much. i'd rather read the Beano than the Watchtower. i liked the colours of the books as a kid.
we had a family study in the Paradise book when i was preschool and later in primary school we studied the Your will be done that was fun and later when i was at home still and pioneering we done the daily text, daily bible reading and studied the Watchtower each week. i still felt i didn't really get it.
but since i left i have enjoyed reading the one you mention Jehovah's Witnesses in the Divine Purpose. one of the points i enjoyed reading about was on page 19
'Based on Paul's statement at 1 Corinthians 15:51,52 it had been expected "that at some time the living saints would be suddenly and miraculously caught away bodily, thenceforth to be forever with the Lord." Believing this would take place in 1878, some were disappointed because nothing occurred that they could see. However, Pastor Russell was led to a reexamination of the scripture and realized that their "mistake lay in expecting to see all the living saints changed at once, and without dying - an erroneous view shared in by the whole nominal church, and one which we had not yet observed or discarded." Russell's re-examination of this text revealed that the true significance of the apostle's words was that those who were to be of Christ's body and who were alive at his presence or after his return would not lie unconscious in the grave as had those who preceded Christ's return. Instead they would be changed instantaneously at death to be present with him. This was really an important revelation of scripture and one that many fundamentalists still have not come to appreciate.'
the book also tells us about the invisible return of Christ in 1874 that was believed. it has helped me to understand what i believed as a witness. Although we had the book since it's publication it's one of those that i never looked at. All though my parents did.
Other books i particularly find interesting now are the "The Nations Shall Know THAT I AM JEHOVAH-HOW? (1971 WTB&TS) and God's Eternal Purpose Now Triumphing FOR MAN'S GOOD (1974 WTB&TS)