Similar Material ad p. 1637 Viper Viper Insight on the Scriptures, Volume 2 Horned Viper New World Translation of the Holy Scriptures (Study Edition) Viper, Horned Aid to Bible Understanding Viper, Horned Insight on the Scriptures, Volume 2 Asp Aid to Bible Understanding Venom Insight on the Scriptures, Volume 2 Asp Insight on the Scriptures, Volume 1 Venom Aid to Bible Understanding Be Careful, Snakes! Awake!—1981 Serpent, Snake Aid to Bible Understanding