Tracks
Every track, measured.
The same venue can host a Motocross national, a Supercross round, or both in the same year. This groups the dataset by the printed track name, so a title sponsor changing between seasons does not invent a new circuit.
The archive prints a track for every event. Where a stadium and its infield are named differently
by the two series (for example a speedway and its surrounding fairgrounds), they stay separate
entries: this page reports the source, it does not merge venues.
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