The March 12, 1961 Independent Star-News (Pasadena, CA) ran an article which heavily quotes Ed Dolker, deputy director of the California Department of Natural Resources. A short excerpt appears below. You can read the entire article here.
"There will be 60 million people in California in the year 2000," Dolder said. "There will be two great metropolises in our state - one that extends from Salinas to Moterey counties and the other from Santa Barabara to San Diego counties."