My favourite JW organization book of all time was "Babylon The Great Has Fallen. God's Kingdom Rules!"
It came out in 1963/64 (I think). I was a handsome young child still years away from puberty and a full-on born--in JW. I was also incredibly bright, reading well above my age by the time I started school.
Unfortunately, my JW parents encouraged me to use my brain by thinking critically and reason - their main failure in raising me. Too late Mom and Dad!
They should have fed me a smilingly simple diet of Sophie and Caleb - but those two little darlings weren't invented then.
The "Babylon the Great..." book was several hundred pages in length and contained a very detailed overview of Biblical history (through Watchtower lens, of course).
It was heavily packed with information, tightly argued and reasoned.
It blasted the churches of Christendom, Catholicism in particular in no uncertain terms. PC did not prevail back then.
It provided a compelling argument that the generation old enough to comprehend the start of World War One would still be alive when Armageddon strikes. It was not the book that drew explicit reference to 1975 (that book came later - about 1965/66 and was titled (I think) "Everlasting Freedom in the Sons of God" or something or other.
Looking back, it is full of holes like the proverbial sieve. But man, back then Watchtower publications did not insult readers' intelligence. Those books were meaty dishes.