Similar Material ad p. 611 Fuel Fuel Insight on the Scriptures, Volume 1 Charcoal Aid to Bible Understanding Coal(s) Insight on the Scriptures, Volume 1 Charcoal Insight on the Scriptures, Volume 1 Dove’s Dung Aid to Bible Understanding Dove’s Dung Insight on the Scriptures, Volume 1 Questions From Readers The Watchtower Announcing Jehovah’s Kingdom—1969 When Fuel for Heating Runs Short Awake!—1974 Dung Aid to Bible Understanding Dung Insight on the Scriptures, Volume 1