Thanks Marmot that brought back old memories, yes that was the summer of the international conventions of 1969
After that convention and the books introduced that summer, I think one could have been the " Babylon the Great " book
that really heated up the end was near policy leading up to 1975
a year or so after 1975 the JWS had the biggest drop of it's followers in its history
but they did sell a whole whack of books in that era.