UNITED STATES SPEEDWAY NATIONAL CHAMPIONSHIP
1998 AMA Speedway National Championship
| Fast Fridays Speedway | |||
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| September 25, 1998 | |||
| Results can be found here | |||
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1998 United States National Speedway Championship
| Costa Mesa Speedway | |||
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| October 3, 1998 | |||
| Results here | |||
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