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A forest of oil derricks makes a ghostly backdrop for a conversation in Signal Hill, California, in 1941. The city is located north of Long Beach in Los Angeles County. The complex geology of the L.A. Basin caused massive amounts of oil to be trapped beneath the city, which fed a booming oil industry at the turn of the century. At their peak, the wells at Signal Hill led California oil production. Photograph by B. Anthony Stewart, National Geographic

Point Vicente Lighthouse in Palos Verdes, north of Los Angeles Harbor, California. It's between Point Loma Lighthouse to the south and Point Conception Lighthouse to the north.

Artist Leo Politi working on his 1964 book, Bunker Hill, Los Angeles, on May 6, 1963. With him is nine-year-old Susan Marshall and county librarian Mary Rogers Smith. L.A. Public Library