Indianapolis. July 7 — GrandPrix of Lexington, Lexington, Ohio. July 13 — GrandPrix of Iowa Race 1, Newton, Iowa. July 14 — GrandPrix of Iowa Race 2, Newton, Iowa. July 21 — Grand ...
May 11 — GrandPrixof Indianapolis, Indianapolis. May 26 — Indianapolis 500, Indianapolis. June 2 — Detroit GrandPrix, Detroit. June 9 — Road America GrandPrix, Plymouth, Wis.
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