The State Historical Society of North Dakota identifies, preserves, interprets, and promotes the heritage of North Dakota and its people. The Society collects and preserves objects that tell the history of the state, ranging from 12,000-year-old Native American artifacts to tools brought by immigrants to items of everyday life in the 21st century. Archival collections range from letters and diaries to newspapers and TV broadcasts. Stories of these artifacts are presented at the State Museum in Bismarck, Pembina State Museum, and additional ND interpretive centers. The Society also provides publications, classroom materials, and special programs statewide. The Society manages 55 historic sites, ranging in age from ancient flint quarries to a Minuteman Missile launch and control facility in use until the 1980s