Similar Material ad p. 1309 Pi A Most Useful and Elusive Number Awake!—2000 Peʼ Aid to Bible Understanding Four Insight on the Scriptures, Volume 1 Four Aid to Bible Understanding Ten Insight on the Scriptures, Volume 2 Ten Aid to Bible Understanding Six Insight on the Scriptures, Volume 2 Six Aid to Bible Understanding Seven Insight on the Scriptures, Volume 2 Seven Aid to Bible Understanding