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Gallery of photos of the start of the 2021 NASA 25 Hours race at Thunderhill Raceway Park, in Willows, CA.

2021_NASA_25hr-Sat-136

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-137

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

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Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

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Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-140

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-141

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

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Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-143

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-144

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-146

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-147

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-148

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-149

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

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Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-151

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

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Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

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Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

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Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

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Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi

2021_NASA_25hr-Sat-157

Image of race cars taking the green flag for the 2021 NASA 25 Hours of Thunderhill at Thunderhill Raceway Park in Willows California.  NASA 25 Hours Race, National Auto Sports Association, NorCal Regi