All vehicle license plates in the United States have a logo and a message alluding to the State to which the vehicle's license plate belongs. At what point in American history was
The Colorful History of California License Plates Los Angeles Magazine
Detail of a historic car with license plates from the 1940s. San Francisco, California | Library of Congress
AB2225 - New California Historical Vehicle Smog Exemption Bill - Classic Car Emissions - YouTube
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History of California License Plates | by Anne T. Kent California Room | Anne T. Kent California Room Newsletter | Medium
California Today: A 1960s License Plate Revival - The New York Times