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| 1/13/2018 | Cocopah Speedway - Somerton, AZ CSRS Round 1 Hobby Stocks, Stock Cars, A Modifieds, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 1st | - | - | 4th |
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| 1/21/2018 | Canyon Speedway Park - Peoria, AZ Winter Challenge Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Dwarf | Results | | Marlyn Seidler (A Modifieds) | 1st | - | - | 17th |
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| 2/2/2018 | Cocopah Speedway - Somerton, AZ Cactus Clash Hobby Stocks, Stock Cars, A Modifieds, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 7th | - | - | 15th |
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| 2/3/2018 | Cocopah Speedway - Somerton, AZ Cactus Clash Hobby Stocks, Stock Cars, A Modifieds, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | - | 9th |
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| 2/9/2018 | Arizona Speedway - Queen Creek, AZ AZ MOD Tour A Modifieds: IMCA Arizona Dirt Tour Dirt Super Late Models, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | 7th | - |
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| 2/10/2018 | Arizona Speedway - Queen Creek, AZ AZ MOD Tour A Modifieds: IMCA Arizona Dirt Tour Dirt Super Late Models, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | 3rd | 22nd |
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| 2/11/2018 | Central Arizona Raceway - Casa Grande, AZ A Modifieds: IMCA Arizona Dirt Tour Dirt Super Late Models, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 1st | - | - | 23rd (DNF) |
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| 2/12/2018 | Central Arizona Raceway - Casa Grande, AZ A Modifieds: IMCA Arizona Dirt Tour Dirt Super Late Models, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 9th (DNF) | - | DNS | - |
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| 2/16/2018 | Cocopah Speedway - Somerton, AZ AZ Mod Tour Night 1 A Modifieds: IMCA Arizona Dirt Tour Dirt Super Late Models, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 4th | - | 1st | 18th |
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| 2/17/2018 | Cocopah Speedway - Somerton, AZ AZ Mod Tour Night 2 A Modifieds: IMCA Arizona Dirt Tour Dirt Super Late Models, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 4th | - | 3rd | 18th |
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| 2/18/2018 | Cocopah Speedway - Somerton, AZ AZ Mod Tour Night 3 A Modifieds: IMCA Arizona Dirt Tour B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 2nd | - | - | 23rd (DNF) |
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| 2/24/2018 | Arizona Speedway - Queen Creek, AZ Frank Soboski Memorial Hobby Stocks, A Modifieds, B Modifieds, 600cc Modifieds, Pure Stock, Ladies - Pure Stocks, Ladies - Bombers | Results | | Marlyn Seidler (A Modifieds) | 5th | - | - | 6th |
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| 3/3/2018 | Cocopah Speedway - Somerton, AZ CSRS Round 2 Hobby Stocks, Stock Cars, A Modifieds, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | - | 13th (DNF) |
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| 3/10/2018 | Central Arizona Raceway - Casa Grande, AZ Stock Cars, A Modifieds, B Modifieds, Dwarf, Pure Stock | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | - | 9th |
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| 3/17/2018 | Cocopah Speedway - Somerton, AZ CSRS Round 3 Hobby Stocks, Stock Cars, A Modifieds, B Modifieds | Results | | Marlyn Seidler (A Modifieds) | 1st | - | - | 3rd |
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| 5/12/2018 | Jamestown Speedway - Jamestown, ND Opening Night A Modifieds, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 4th | - | - | 5th |
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| 5/25/2018 | Dacotah Speedway - Mandan, ND Mandan Dirt Series - Season Opener Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | - | 7th |
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| 5/26/2018 | Jamestown Speedway - Jamestown, ND Armed Forces Night A Modifieds, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 2nd | - | - | 17th |
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| 6/8/2018 | Dacotah Speedway - Mandan, ND 40/40 Iron Man Challenge Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 7th | - | 2nd | 6th |
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| 6/9/2018 | Jamestown Speedway - Jamestown, ND NOSA Sprint Cars 410 Sprints - Winged, A Modifieds, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 6th | - | - | 11th |
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| 6/15/2018 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 2nd | - | - | 1st |
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| 6/22/2018 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 5th | - | 1st | 5th |
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| 6/23/2018 | Jamestown Speedway - Jamestown, ND Kids Night A Modifieds, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Rain Out |
| 6/29/2018 | McLean County Speedway - Underwood, ND A-Mod Showdown before Sundown Hobby Stocks, A Modifieds, B Modifieds, Street Stocks, Generic 1 | Results | | Marlyn Seidler (A Modifieds) | 2nd | - | - | 4th |
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| 7/4/2018 | Jamestown Speedway - Jamestown, ND Fireworks Spectacular A Modifieds, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | - | 4th |
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| 7/7/2018 | Jamestown Speedway - Jamestown, ND Dakota Classified Modified Tour Stock Cars, A Modifieds | Results | | Marlyn Seidler (A Modifieds) | 1st | - | - | 7th |
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| 7/8/2018 | Nodak Speedway - Minot, ND | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | 5th | 21st |
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| 7/9/2018 | Estevan Motor Speedway - Estevan, SK Stock Cars, A Modifieds, Street Stocks | Results | | Marlyn Seidler (A Modifieds) | 1st | - | - | - |
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| 7/10/2018 | Williston Basin Speedway - Williston, ND Stock Cars, A Modifieds, Street Stocks | Results | | Marlyn Seidler (A Modifieds) | 6th | - | 7th | - |
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| 7/11/2018 | Southwest Speedway - Dickinson, ND Dakota Classic IMCA Mod Tour Stock Cars, A Modifieds | Results | | Marlyn Seidler (A Modifieds) | 4th | - | 4th | 28th (DNF) |
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| 7/12/2018 | Dacotah Speedway - Mandan, ND Dakota Classic Modified Tour Championship Stock Cars, A Modifieds | Results | | Marlyn Seidler (A Modifieds) | 4th | - | 3rd | 21st |
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| 7/13/2018 | Dacotah Speedway - Mandan, ND Legendary 50 A Modifieds, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | - | 16th |
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| 7/14/2018 | Jamestown Speedway - Jamestown, ND LIGHTNING SPRINTS A Modifieds, Lightning Sprints, Winged Crate Sprints, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 4th | - | - | 1st |
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| 7/20/2018 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 4th | - | - | 8th |
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| 7/21/2018 | Jamestown Speedway - Jamestown, ND Amsoil Wissota 100 Race of Champions A Modifieds, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 5th | - | - | 11th |
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| 7/27/2018 | Dacotah Speedway - Mandan, ND North Dakota Governor's Cup - Night 1 410 Sprints - Winged, Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | - | 8th |
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| 7/28/2018 | Dacotah Speedway - Mandan, ND North Dakota Governor's Cup - Night 2 410 Sprints - Winged, Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 2nd | - | - | 12th |
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| 8/4/2018 | Jamestown Speedway - Jamestown, ND NLRA Late Models A Modifieds, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Late Model, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 6th | - | - | 7th |
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| 8/10/2018 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 4th | - | - | 1st |
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| 8/11/2018 | Jamestown Speedway - Jamestown, ND Points Race A Modifieds, Semi-Pro Legends, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Street Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 4th | - | - | 18th (DNF) |
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| 8/17/2018 | Dacotah Speedway - Mandan, ND Mandan Dirt Series Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 8th (DNF) | - | - | DNS |
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| 8/24/2018 | Dacotah Speedway - Mandan, ND Mandan Dirt Series - Championship Night Hobby Stocks, A Modifieds, Semi-Pro Legends, Sport Compact, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 4th | - | - | 20th (DNF) |
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| 8/31/2018 | Gillette Thunder Speedway - Gillette, WY East-West-Clash Hobby Stocks, A Modifieds, Sport Compact, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Late Model, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 2nd | - | - | 6th |
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| 9/1/2018 | Gillette Thunder Speedway - Gillette, WY East-West-Clash Hobby Stocks, A Modifieds, Sport Compact, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Late Model, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 1st | - | - | 2nd |
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| 9/2/2018 | Gillette Thunder Speedway - Gillette, WY East-West-Clash Hobby Stocks, A Modifieds, Sport Compact, WISSOTA Midwest Mods, WISSOTA Mod Four, WISSOTA Late Model, WISSOTA Street Stock | Results | | Marlyn Seidler (A Modifieds) | 3rd | - | - | 14th |
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| 9/21/2018 | Jamestown Speedway - Jamestown, ND 47th ANNUAL STOCK CAR STAMPEDE night 1 A Modifieds, Midwest Modifieds, B Modifieds, Semi-Pro Legends, Pure Stock, All Star Slingshots, WISSOTA Midwest Mods, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock, Junior Slingshots | Results | | Marlyn Seidler (A Modifieds) | 2nd | - | - | 7th |
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| 9/28/2018 | Dacotah Speedway - Mandan, ND Octoberfest Special Night 1 Hobby Stocks, A Modifieds, B Modifieds, Street Stocks, Semi-Pro Legends, Sport Compact | Results | | Marlyn Seidler (A Modifieds) | 1st | - | - | 1st |
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| 9/29/2018 | Southwest Speedway - Dickinson, ND Octoberfest Special Hobby Stocks, A Modifieds, Semi-Pro Legends, Limited Sport Mod, Sport Compact, WISSOTA Street Stock | Rain Out |