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URR or Urr may refer to: *Urea reduction ratio, used to quantify dialysis treatment adequacy *Urr Water, a river in Scotland * *Haugh of Urr, a village by the Urr Water, in the Urr parish * *Motte of Urr, a "motte-and-bailey" castle near the Haugh of Urr, beside the Urr Water *Union Railroad is a name, or part of a name, that has been used by many companies, mainly in the US * *Union Railroad (Pennsylvania) is possibly the only current user of that name *Underground Railroad, an informal escape network used by 19th-century black slaves in the US * ''Ultima Ratio Regum'', a historical roguelike game 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「URR」の詳細全文を読む スポンサード リンク
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