who are elected by the Osage constituency and serve four-year terms. They hold two regular congressional sessions and are headquartered in Pawhuska. Economic development The Osage Nation issues its own tribal vehicle tags and operates its own housing authority. The tribe owns a truck stop, a gas station, and ten smoke shops. In the 21st century, it opened its first gaming casino and as of December 2013 has seven casinos. Casinos are located in Tulsa, Sand Springs, Bartlesville, Skiatook, Ponca City, Hominy and Pawhuska. The tribe's annual economic impact in 2010 was estimated to be $222 million. Osage Million Dollar Elm, the casino management company, is encouraging employees in education, paying for certificate classes related to their business, as well as for classes leading to bachelor's and master's business degrees. Osage Nation Museum Located in Pawhuska, Oklahoma, the Osage Nation Museum provides interpretations and displays of Osage history, art, and culture. The continuously changing exhibits convey the story of the Osage people throughout history and celebrate Osage culture today. Highlights include an extensive photograph collection, historical artifacts, and traditional and contemporary art. Founded in 1938, the museum is the oldest tribally owned museum in the United States. Historian Louis F. Burns donated much of his extensive personal collection of artifacts and documents to the museum. In 2021, a Missouri cave was discovered with ancient Osage art. The contents were sold at auction, but the Osage leadership insists it belongs to the nation. Representations in literature John Joseph Mathews, an Osage writer and historian, explored the adverse social effects of the oil boom for the Osage Nation in his semi-autobiographical novel Sundown (1934); he also wrote histories of the nation, based in part on the oral histories of tribal elders. Laura Ingalls Wilder wrote a series of children's books, known as Little House on the Prairie (1932–1943). The novel Little House on the Prairie and its TV adaptation are based on her family's pioneer days in Kansas. They illegally squatted on Osage land and encountered members of the tribe. Education In July, 2019, the tribe chartered Bacone College in Muskogee, Oklahoma, as its tribal college. Notable Osage Fred Lookout (1865-1949), principal chief Monte Blue (1887–1963), American actor of the silent and sound eras. Louis F. Burns (1920–2012), historian and author, a leading expert on Osage history, customs, and mythology. Charles Curtis, vice-president of the United States under Herbert Hoover, a descendant