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This booklet (free too, online) is from: http://www.lightministries.com/SDA/Booklets/id963.htm
In audio, online here: http://www.lightministries.com/SDA/Movement-of-Revelation-18-part-1.mp3
In audio, online here: http://www.lightministries.com/SDA/Movement-of-Revelation-18-part-2.mp3