TULSA, a city of Oklahoma, U.S.A., 218 m. (by air) S. by W. of Kansas City, on the Arkansas river; county seat of Tulsa county. It is on Federal highways 64, 66 and 75 ; and is served by the Frisco, the Midland Valley, the Missouri-Kansas-Texas, the Oklahoma Union, the Sand Springs, the Santa Fe and electric railways. Pop. (1920) 72,075 (84% native white and 12% ne groes) ; 141,258 in 1930 by the Federal census. It was the second largest city of the State in 1930, and is frequently called "the oil capital of the world." The city occupies 17 sq.m., Soo ft. above sea-level, at the meeting-point of the old boundaries of the Creek, the Cherokee and the Osage Nations. The old council tree of the Creeks, a large elm, still stands. There has been a commission form of government since 1908; and a city plan and a regional plan have been adopted. The water supply is brought from a reservoir in the Spavinaw Hills (6o m. E) by force of gravity alone, though the difference in elevation of source and terminus is only 90 ft. Mohawk Reservoir, a 500,000,000-gal. reserve, is the central feature of a park of 2,000 ac. of timbered land, with
lagoons, lakes and watercourses fed by the surplus from the reservoir. There are 34 public, two parochial and several private schools. The University of Tulsa, founded at Muskogee in 1894 as Henry Kendall College, was moved there in 1907. The city's assessed valuation for 1928 was $126,352,220. Tulsa is the commercial and financial capital of a rich agricultural country, and of oilfields producing an average of 400,000 barrels of crude oil a day. All but one of the large companies operating in the Mid Continent Field have headquarters here, and the International Petroleum Exposition is held here annually. The output of the city's factories in 1927 was valued at $20,300,932. White settle ment began in 1882, when an extension of the Frisco line was com pleted to the Indian trading post. "Tulsey Town," as it was called then, grew slowly, reaching a population of 1,390 in 190o. It was chartered as a city in 1902. Oil developments began in 1901. In 1910 the population had increased to 18,182.