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In 1971, the "It Is Written" production studios moved to the Adventist Media Center in Thousand Oaks, California. In 1975, Vandeman began conducting Revelation Seminars. The seminars consisted of a one-day, eight-hour Bible study followed by a luncheon. Over a course of 10 years, tens of thousands of "It Is Written" viewers traveled hundreds of miles to attend one of 300 seminars.