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Alva, city, seat (1907) of Woods county, northwestern Oklahoma, U.S., on Salt Fork of the Arkansas River near the Kansas border. Established as a land office in 1893 at a Santa Fe Railway stop, it was named for Alva Adams, a railroad attorney and governor of Colorado (1887–89). It is a marketing and processing centre for a wheat and livestock area. Manufactures include tractors and furniture; petroleum and natural gas are local resources. It is...