CREATE TABLE table_4766 ("Name" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning driver" TEXT, "Winning team" TEXT, "Report" TEXT)

What race did Bobby Unser win?
SELECT "Name" FROM table_4766 WHERE "Winning driver" = 'bobby unser'
SELECT "Name" FROM "table_4766" WHERE "Winning driver" = 'bobby unser'