Hi VM,
Yes, there was a Watchtower article in the late 70s or early 80s about what books should be in the KH library. However, it also had a list of prohibited items. Among those not approved by the Watchtower Vatican were books on "higher critisism." That meant that the Passover Plot had to go. If I remember correctly, there was even a copy of Hans Kung's On Being Christian in the library. Of course it too was discarded. So much for the Watchtower's allowing JWs freedom of thought.