In 1992, a reader of "The Urantia Book", Matthew Block, self-published a paper that showed "The Urantia Book" utilized material from 15 other books. All of the source authors identified in Block's paper were published in English between 1905 and 1943 by U.S. publishers and are typically scholarly or academic works that contain concepts and wording similar to what is found in "The Urantia Book". Block has since claimed to have discovered over 125 source texts that were incorporated into the papers.