Similar Material it-2 “Tin” Tin Aid to Bible Understanding Lead Insight on the Scriptures, Volume 2 Lead Aid to Bible Understanding Plummet Aid to Bible Understanding Plummet Insight on the Scriptures, Volume 2 Copper Aid to Bible Understanding Copper, Brass, Bronze Insight on the Scriptures, Volume 1 Opposition Tactics Rebound The Watchtower Announcing Jehovah’s Kingdom—1964 ‘A Plummet in Jehovah’s Hand’ The Watchtower Announcing Jehovah’s Kingdom—1979 Pewter—For You? Awake!—1979