Similar Material it-1 “Flint” Flint Aid to Bible Understanding Knife Insight on the Scriptures, Volume 2 Knife Aid to Bible Understanding Questions From Readers The Watchtower Announcing Jehovah’s Kingdom—1988 Helkath-hazzurim Insight on the Scriptures, Volume 1 Zeror Insight on the Scriptures, Volume 2 Was There a Prehistoric “Stone Age”? Awake!—1973 Gilgal Insight on the Scriptures, Volume 1 Limestone—Commonplace but Precious Awake!—1992 The Art of Spark Testing Steels Awake!—1976