Oil production in the Los Angeles Basin started with the discovery of the Brea-Olinda Oil Field in 1880, and continued with the development of the Los Angeles City Oil Field in 1893, the Beverly Hills Oil Field in 1900, the Salt Lake Oil Field in 1902, and many others. The discovery of the Long Beach Oil Field in 1921, which proved to be the world's richest in production per-acre of the time, increased the importance of the Los Angeles Basin as a worldwide oil producer. This increased again with the discovery of the Wilmington Oil Field in 1932, and the development of the Port of Los Angeles as a means of shipping crude oil overseas.