Sites:
| Good Ol' Time Racing Association: GOTRA is a vintage dirt modified racing organization for racing coupes and sedans dated 1928 through 1948. | | S.M.A.R.T.: Southern Modified Auto Racing Teams sanctioning body, based in Kernersville, North Carolina. | | United Midwestern Promoters: UMP is an open wheel modified sanctioning body. | | USA Modifieds: News, schedule, driver profiles, point standings and rules. | | USMTS: United States Modified Touring Series, including forum, schedule, results, points, and driver information. Also includes information about the United States Racing Association. |
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