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| 1/6/2021 | Cocopah Speedway - Somerton, AZ Cocopah Speedway 2021 Winter Nationals presented by Yuma Insurance IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 7th | - | 11th | - |
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| 1/7/2021 | Cocopah Speedway - Somerton, AZ Cocopah Speedway 2021 Winter Nationals presented by Yuma Insurance IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 9th | - | 14th | - |
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| 1/8/2021 | Cocopah Speedway - Somerton, AZ Cocopah Speedway 2021 Winter Nationals presented by Yuma Insurance IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 11th | - | 17th | - |
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| 1/9/2021 | Cocopah Speedway - Somerton, AZ Cocopah Speedway 2021 Winter Nationals presented by Yuma Insurance Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 7th | - | 14th | - |
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| 1/13/2021 | Cocopah Speedway - Somerton, AZ Gene Freeman Memorial Pit Crew Challenge, IMCA Sport Compacts and Open Practice Hornets, Generic 1, Generic 2, IMCA Sport Compact | Results | | William Miller (Generic 1) | - | - | - | - |
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| 1/14/2021 | Cocopah Speedway - Somerton, AZ Cocopah Speedway 2021 Winter Nationals presented by Yuma Insurance IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 8th | - | 10th | - |
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| 1/15/2021 | Cocopah Speedway - Somerton, AZ Cocopah Speedway 2021 Winter Nationals presented by Yuma Insurance IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 6th | - | 11th | - |
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| 1/16/2021 | Cocopah Speedway - Somerton, AZ Cocopah Speedway 2021 Winter Nationals presented by Yuma Insurance Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 9th | - | 8th | - |
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| 1/29/2021 | Cocopah Speedway - Somerton, AZ Dirt Late Models, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 6th | - | - | 17th |
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| 1/30/2021 | Cocopah Speedway - Somerton, AZ Dirt Late Models, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 4th | - | - | 13th |
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| 2/6/2021 | Canyon Speedway Park - Peoria, AZ Hobby Stocks, Stock Cars, A Modifieds, Limited Sport Mod, Senior Micros | Results | | William Miller (A Modifieds) | 6th | - | - | 18th |
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| 2/7/2021 | Canyon Speedway Park - Peoria, AZ Hobby Stocks, Stock Cars, A Modifieds, Limited Sport Mod, Senior Micros | Results | | William Miller (A Modifieds) | 5th | - | - | 8th |
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| 2/19/2021 | Cocopah Speedway - Somerton, AZ WESTERN STATES DWARF CAR NATIONALS Dwarf: Western States Dwarf Car Association Vintage Modifieds, Cage Jr. Sprints, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, Mod Lites, Sportsman Dwarf, Veteran Dwarf, Pro Dwarf | Results | | William Miller (IMCA Modified) | 7th | - | - | 11th |
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| 2/20/2021 | Cocopah Speedway - Somerton, AZ WESTERN STATES DWARF CAR NATIONALS Dwarf: Western States Dwarf Car Association Cage Jr. Sprints, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, Mod Lites, Sportsman Dwarf, Veteran Dwarf, Pro Dwarf | Results | | William Miller (IMCA Modified) | 5th | - | - | 11th |
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| 2/27/2021 | Central Arizona Raceway - Casa Grande, AZ Weekly Racing Stock Cars, A Modifieds, B Modifieds, Pure Stock | Results | | William Miller (A Modifieds) | 4th | - | - | 16th |
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| 3/6/2021 | Cocopah Speedway - Somerton, AZ Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 3rd | - | - | 8th |
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| 3/13/2021 | Central Arizona Raceway - Casa Grande, AZ 11 Mile Corner Reunion Stock Cars, A Modifieds, B Modifieds, Pure Stock | Results | | William Miller (A Modifieds) | - | - | - | DNS |
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| 3/18/2021 | Cocopah Speedway - Somerton, AZ OPEN PRACTICE (ALL DIVISIONS) 6PM-9PM Generic 2 | Results | | William Miller (Generic 2) | - | - | - | - |
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| 3/19/2021 | Cocopah Speedway - Somerton, AZ WILD WEST MODIFIED TOUR IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 2nd | - | - | 10th |
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| 3/20/2021 | Cocopah Speedway - Somerton, AZ WILD WEST MODIFIED TOUR IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 3rd | - | - | 18th |
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| 3/27/2021 | Canyon Speedway Park - Peoria, AZ Fan Appreciation Night Hobby Stocks, Stock Cars, A Modifieds, Dirt Late Models, 600cc Modifieds, Limited Sport Mod, Pro Dwarf | Results | | William Miller (A Modifieds) | 7th | - | - | 10th |
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| 4/3/2021 | Mohave Valley Raceway - Bullhead City, AZ Stock Cars, A Modifieds, B Modifieds, Street Stocks, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 5th | - | - | 11th |
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| 4/10/2021 | Cocopah Speedway - Somerton, AZ Dwarf, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Hobby Stock, IMCA Sport Compact, Mod Lites | Results | | William Miller (IMCA Modified) | 2nd | - | - | 7th |
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| 4/16/2021 | Battle Mountain Raceway - Battle Mountain, NV Hobby Stocks, Winged A-Class, Dwarf, Sport Compact, IMCA Modified | Results | | William Miller (IMCA Modified) | - | - | - | 14th |
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| 4/17/2021 | Battle Mountain Raceway - Battle Mountain, NV Hobby Stocks, Winged A-Class, Dwarf, Sport Compact, IMCA Modified | Results | | William Miller (IMCA Modified) | - | - | - | 9th |
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| 4/24/2021 | Cocopah Speedway - Somerton, AZ Dirt Late Models, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 5th (DNF) | - | - | 8th |
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| 5/1/2021 | Canyon Speedway Park - Peoria, AZ Hobby Stocks, Stock Cars, A Modifieds, Limited Sport Mod, Sport Compact | Results | | William Miller (A Modifieds) | 4th | - | - | 4th |
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| 5/8/2021 | Cocopah Speedway - Somerton, AZ 360 Sprints - Winged: ASCS Southwest Region Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 4th | - | - | 5th |
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| 5/14/2021 | Battle Mountain Raceway - Battle Mountain, NV Northern Nevada Shootout Hobby Stocks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 2nd | - | - | 9th |
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| 5/15/2021 | Winnemucca Regional Raceway - Winnemucca, NV Northern Nevada Shootout Hobby Stocks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 3rd | - | - | 8th |
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| 5/22/2021 | Central Arizona Raceway - Casa Grande, AZ Weekly Racing Stock Cars, A Modifieds, B Modifieds, Pure Stock | Results | | William Miller (A Modifieds) | 4th | - | - | 8th |
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| 5/28/2021 | Cocopah Speedway - Somerton, AZ Stock Cars, Dwarf, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Hobby Stock, IMCA Sport Compact, Mod Lites | Results | | William Miller (IMCA Modified) | 4th | - | - | 9th |
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| 5/29/2021 | Cocopah Speedway - Somerton, AZ Stock Cars, Dwarf, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Hobby Stock, IMCA Sport Compact, Mod Lites | Results | | William Miller (IMCA Modified) | 5th | - | - | 7th |
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| 6/5/2021 | Central Arizona Raceway - Casa Grande, AZ 360 Sprints - Winged, Stock Cars, A Modifieds, Restricted 'A' Class, Winged A-Class, B Modifieds, 360 Sprints - Non-Winged, Non-Winged Sprints, Pure Stock | Results | | William Miller (A Modifieds) | 1st | - | - | 18th |
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| 6/12/2021 | Barona Speedway Park - Ramona, CA Barona Speedway Round 6 A Modifieds, Street Stocks, 360 Sprints - Non-Winged, Junior Sprints, Dwarf, Lightning Sprints, Kid Karts Dirt, Pony Stock, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Southern SportMod, IMCA Sport Compact, Sportsman Dwarf, IMCA Mod Lite | Results | | William Miller (IMCA Modified) | 5th | - | - | 2nd |
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| 6/18/2021 | Sweetwater Speedway - Rock Springs, WY Wild West Modified Tour A Modifieds: Wild West Modified Tour B Modifieds, Street Stocks, 250 yamaha, Asphalt Street Stocks, Generic 1, Generic 2 | Results | | William Miller (A Modifieds) | 8th (DNF) | - | 10th (DNF) | - |
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| 6/19/2021 | Sweetwater Speedway - Rock Springs, WY Wild West Modified Tour A Modifieds: Wild West Modified Tour B Modifieds, Street Stocks, 250 yamaha, Asphalt Street Stocks, Generic 1, Generic 2 | Results | | William Miller (A Modifieds) | 8th | - | 6th | 21st |
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| 6/26/2021 | Barona Speedway Park - Ramona, CA Barona Speedway Round 7 A Modifieds, Street Stocks, Junior Sprints, Dwarf, Kid Karts Dirt, Pony Stock, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Southern SportMod, IMCA Sport Compact, Sportsman Dwarf, IMCA Mod Lite | Results | | William Miller (IMCA Modified) | 6th | - | - | 2nd |
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| 7/10/2021 | Barona Speedway Park - Ramona, CA Barona Speedway Round 8 A Modifieds, Street Stocks, Junior Sprints, Dwarf, Lightning Sprints, Lawn Mower Supermodified, Lawn Mower Stock, Kid Karts Dirt, Pony Stock, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Southern SportMod, IMCA Sport Compact, Sportsman Dwarf, IMCA Mod Lite | Results | | William Miller (IMCA Modified) | 4th | - | - | 4th |
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| 7/16/2021 | Desert Thunder Raceway - Price, UT Wild West Modified Tour Sportsmans, Hornets, Limited Sport Mod, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 6th | - | - | 14th |
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| 7/17/2021 | Desert Thunder Raceway - Price, UT Wild West Modified Tour Sportsmans, Hornets, Limited Sport Mod, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 5th | - | - | 20th (DNF) |
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| 7/24/2021 | Barona Speedway Park - Ramona, CA Barona Speedway Round 9 Street Stocks, Junior Sprints, Kid Karts Dirt, Pony Stock, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Hobby Stock, IMCA Sport Compact, Sportsman Dwarf | Results | | William Miller (IMCA Modified) | 2nd | - | - | 4th |
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| 8/7/2021 | Barona Speedway Park - Ramona, CA Barona Speedway Round 10 A Modifieds, 360 Sprints - Non-Winged, Junior Sprints, Dwarf, Lightning Sprints, Kid Karts Dirt, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Southern SportMod, IMCA Sport Compact, Sportsman Dwarf, IMCA Mod Lite | Results | | William Miller (IMCA Modified) | 6th (DNF) | - | - | 8th (DNF) |
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| 8/21/2021 | Barona Speedway Park - Ramona, CA Barona Speedway Round 11 A Modifieds, Street Stocks, Junior Sprints, Dwarf, Lightning Sprints, Kid Karts Dirt, Pony Stock, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Southern SportMod, Sportsman Dwarf, IMCA Mod Lite | Results | | William Miller (IMCA Modified) | 3rd | - | - | 12th |
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| 9/4/2021 | Mohave Valley Raceway - Bullhead City, AZ Street Stocks, Dwarf, Junior Sportsman Dirt Karts, Senior Flathead Heavy Dirt Karts, Sport Compact, IMCA Modified, IMCA Northern SportMod, Mod Lites, Drag - DEMO Class 1, Drag - DEMO Class 2 | Results | | William Miller (IMCA Modified) | 6th | - | 2nd | 12th |
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| 9/5/2021 | Mohave Valley Raceway - Bullhead City, AZ Stock Cars, Dwarf, Junior Sportsman Dirt Karts, Senior Flathead Heavy Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Sport Compact, Mod Lites, Drag - DEMO Class 1, Drag - DEMO Class 2, Ladies - Bombers | Results | | William Miller (IMCA Modified) | 8th | - | 5th | 17th |
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| 9/18/2021 | Barona Speedway Park - Ramona, CA Barona Speedway Round 13 A Modifieds, Street Stocks, Junior Sprints, Dwarf, Lightning Sprints, Kid Karts Dirt, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Sport Compact, Sportsman Dwarf, IMCA Mod Lite | Results | | William Miller (IMCA Modified) | 3rd | - | - | 8th |
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| 9/23/2021 | Cocopah Speedway - Somerton, AZ OPEN PRACTICE (ALL DIVISIONS) 6PM-9PM Generic 2 | Results | | William Miller (Generic 2) | - | - | - | - |
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| 9/25/2021 | Cocopah Speedway - Somerton, AZ MIKE CORNING MEMORIAL Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 4th | - | - | 4th |
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| 9/26/2021 | Cocopah Speedway - Somerton, AZ MIKE CORNING MEMORIAL Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 4th | - | - | 4th |
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| 10/2/2021 | Barona Speedway Park - Ramona, CA Barona Speedway Round 14 A Modifieds, Street Stocks, 360 Sprints - Non-Winged, Junior Sprints, Dwarf, Lightning Sprints, Kid Karts Dirt, Pure Stock, IMCA Modified, IMCA Northern SportMod, IMCA Sport Compact, Sportsman Dwarf, IMCA Mod Lite | Results | | William Miller (IMCA Modified) | 4th | - | - | 4th |
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| 10/8/2021 | Cocopah Speedway - Somerton, AZ DEACON DICK MEMORIAL IMCA Modified, IMCA Northern SportMod, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (IMCA Modified) | 4th | - | - | 6th | | William Miller (IMCA Sport Compact) | 1st | - | - | 3rd |
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| 10/9/2021 | Cocopah Speedway - Somerton, AZ DEACON DICK MEMORIAL Enduro, IMCA Modified, IMCA Northern SportMod, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Miller (Enduro) | - | - | - | 7th | | William Miller (IMCA Modified) | 4th | - | - | 6th | | William Miller (IMCA Sport Compact) | - | - | - | - |
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| 10/16/2021 | Central Arizona Raceway - Casa Grande, AZ Weekly Racing at Central Arizona Speedway Stock Cars, A Modifieds, B Modifieds, Pure Stock | Results | | William Miller (A Modifieds) | 2nd | - | - | 2nd |
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| 10/30/2021 | Cocopah Speedway - Somerton, AZ HALLOWEEN SPECTACULAR Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Hobby Stock, IMCA Sport Compact, Mod Lites | Results | | William Miller (IMCA Modified) | 4th | - | - | 16th |
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| 11/4/2021 | Cocopah Speedway - Somerton, AZ OPEN PRACTICE (ALL DIVISIONS) 6PM-9PM Generic 2 | Results | | William Miller (Generic 2) | - | - | - | - |
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| 11/5/2021 | Cocopah Speedway - Somerton, AZ GORDIE RIVERA MEMORIAL IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 6th | - | - | 21st |
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| 11/6/2021 | Cocopah Speedway - Somerton, AZ GORDIE RIVERA MEMORIAL IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 6th | - | - | 15th |
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| 11/25/2021 | Cocopah Speedway - Somerton, AZ OPEN PRACTICE (ALL DIVISIONS) 6PM-9PM Generic 2, IMCA Modified | Results | | William Miller (Generic 2) | - | - | - | - |
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| 11/26/2021 | Cocopah Speedway - Somerton, AZ HARVEST HUSTLE TURKEY CLASSIC Stock Cars, Dirt Late Models, Dwarf, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 6th | - | - | 11th |
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| 11/27/2021 | Cocopah Speedway - Somerton, AZ HARVEST HUSTLE TURKEY CLASSIC Stock Cars, Dirt Late Models, Dwarf, Kid Karts Dirt, Junior Sportsman Dirt Karts, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Miller (IMCA Modified) | 5th | - | - | 18th |
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