Similar Material it-1 “Fortifications” Fortifications Aid to Bible Understanding Rampart Insight on the Scriptures, Volume 2 Walls Insight on the Scriptures, Volume 2 Walls Aid to Bible Understanding Tower Insight on the Scriptures, Volume 2 Tower Aid to Bible Understanding City Insight on the Scriptures, Volume 1 Jerusalem Insight on the Scriptures, Volume 2 Babylon Insight on the Scriptures, Volume 1 Battering Ram Insight on the Scriptures, Volume 1