re: Seattle caves. They are now "Home of the 12s"

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Since before 1921?

Please provide an example

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The first recorded use of the term "twelfth man" was a magazine published by the University of Minnesota in September, 1900, that referred to "the mysterious influence of the twelfth man on the team, the rooter."[1] Later, in the November 1912 edition of The Iowa Alumnus, an alumni publication of the University of Iowa (then known as State University of Iowa), E.A. McGowan described the 1903 game between Iowa and the University of Illinois. In his article, titled "The Twelfth Player" McGowan wrote: "The eleven men had done their best; but the twelfth man on the team (the loyal spirited Iowa rooter) had won the game for old S.U.I."[2]

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