The UO is the founding member and host of the Orbis-Cascade Alliance, a consortium of academic and research libraries in Oregon, Washington and Idaho. The combined collections of the Alliance exceed 20 million volumes and can be searched via the Summit union catalog. The Orbis Cascade Alliance serves faculty and the equivalent of more than 258,000 full-time students. In addition to its members, the Alliance extends selected services to more than 280 libraries, museums, archives, and historical societies in seven western states.