"In the 1940s, Thomas had an epiphany and moved the company to Southern California, which in the postwar boom was quickly becoming the epitome of America's car culture. With the Southland's constant expansion and a road network that features a bewildering lack of consistent numbering, the Thomas brothers had tapped into a ready-made market that grew with each year's update... The work that's done at Thomas Bros. in Irvine is far more prosaic. About 70 people work in cubicles amid insurance-office quiet, updating information and redrawing maps by computer."
Thanks to Chris Steins