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| 3/31/2018 | Grayson County Speedway - Bells, TX First Point Race for 2018 DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, Street Stocks | Results | | Marilyn Williams (A Modifieds) | 4th | - | 9th | 22nd (DNF) |
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| 4/14/2018 | Grayson County Speedway - Bells, TX Restricted 'A' Class: NOW600 National Micros with NOW600 Restricted Micros Stock Non-Wing: NOW600 Non-Wing Micros DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, Street Stocks, 600cc Modifieds | Results | | Marilyn Williams (A Modifieds) | 6th (DNF) | - | - | 20th |
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| 4/28/2018 | Grayson County Speedway - Bells, TX STEM Series DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, Street Stocks, Rookie Class | Results | | Marilyn Williams (A Modifieds) | 5th | - | 12th | 23rd |
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| 5/5/2018 | Grayson County Speedway - Bells, TX Regular race night/ Rookie DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, Street Stocks, 600cc Modifieds | Results | | Marilyn Williams (A Modifieds) | 7th | - | - | DNS |
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| 5/12/2018 | Grayson County Speedway - Bells, TX 360 Sprint Car Bandit DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, Street Stocks | Results | | Marilyn Williams (A Modifieds) | 6th | - | - | 18th (DNF) |
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| 6/16/2018 | Grayson County Speedway - Bells, TX Powder Puff Race DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, B Modifieds, Street Stocks, 600cc Modifieds, Pony Stock | Results | | Marilyn Williams (600cc Modifieds) | 2nd | - | - | 6th (DNF) |
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| 6/23/2018 | Grayson County Speedway - Bells, TX Side by Side + Rookie DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, Street Stocks, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 3rd | - | - | 5th |
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| 6/30/2018 | Grayson County Speedway - Bells, TX Firework's & Southern Texas Late Model Series. Dirt Late Models: XR Southern Storm DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 3rd | - | - | 7th |
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| 7/7/2018 | Grayson County Speedway - Bells, TX Rookie Class DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, Street Stocks, Rookie Class, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 5th | - | - | 6th |
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| 7/14/2018 | Grayson County Speedway - Bells, TX Texas Wing Modified Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, Street Stocks, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 3rd | - | - | 7th |
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| 7/21/2018 | Grayson County Speedway - Bells, TX Regular race DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, Street Stocks, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 2nd | - | - | 3rd |
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| 7/28/2018 | Grayson County Speedway - Bells, TX Rookie Class DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, Street Stocks, Rookie Class, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 5th | - | - | DNS |
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| 8/4/2018 | Grayson County Speedway - Bells, TX STEM Series DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, Street Stocks, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 4th | - | - | 6th |
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| 8/11/2018 | Grayson County Speedway - Bells, TX Mechanic/Staff Race DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, Street Stocks, 600cc Modifieds, Pony Stock | Rain Out |
| 8/18/2018 | Grayson County Speedway - Bells, TX Rookie Class DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, Street Stocks, Rookie Class, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 3rd | - | - | 4th |
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| 9/1/2018 | Grayson County Speedway - Bells, TX Regular race DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, Street Stocks, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 5th | - | - | 3rd |
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| 9/8/2018 | Grayson County Speedway - Bells, TX NON IMCA Points night (last race for the Rookie class) Factory Stocks, Hobby Stocks, Stock Cars, B Modifieds, Street Stocks, Rookie Class, 600cc Modifieds, Pony Stock | Results | | Marilyn Williams (600cc Modifieds) | 3rd | - | - | 8th |
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| 9/29/2018 | Grayson County Speedway - Bells, TX Last IMCA points race / Powder Puff race DIRTcar UMP Modifieds, Factory Stocks, Hobby Stocks, A Modifieds, Street Stocks, 600cc Modifieds | Results | | Marilyn Williams (600cc Modifieds) | 1st | - | - | 7th |
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