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In 1969 George Knowles developed a small group seminar. He joined "It Is Written", and together with George Vandeman prepared a day-long seminar, which developed into the "It Is Written Revelation Seminar" by 1975. Soon others ran their own seminars. A resource center founded in Texas in 1980 was named Seminars Unlimited in 1986, and by the 1990s was distributing evangelistic materials to Adventists worldwide.