The 1920 census lists him as a pipe fitter for the railroad. The 1930 census lists him in LA with his wife and son, working as an attendant for a gas station, with his daughter and her husband living next door. Dennis Holliday says Shields' granddaughter was a princess in one of the Rose Parades.
Here's a picture of Shields at the gas station he ran. (Gilmore Red Lion Gasoline, S. S. Ogden Service. NO SMOKING - STOP YOUR MOTOR. Gilmore Gas, it's Fortified. Red Lion, 18 1/2 cents. Blue-green, 16 1/2. White Fleet, 14 9/10.)
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