1950s: In the oil business, in the 1950s, Davis Bros. was the most active independent in Kansas. Davis Bros. acquired large mineral packages primarily from insurance companies. They acquired in excess 500,000 gross acres of minerals (over 100,000 net) in 22 states. These acquisitions represented the entire mineral assets of the Alliance Life Insurance Company, Peoria, Illinois; the Central Standard Life Insurance Company, Chicago, Illinois; the Commerce Trust Bank, Kansas City, Missouri; the Wilbe Lumber Company, Des Moines, Iowa; and the interests of numerous individuals and states. These mineral interests are primarily concentrated in the Anadarko and Arkoma Basins in Oklahoma, the Delaware Basin of Texas and New Mexico, and the Salt Basin and Smackover Provinces of Mississippi.