The great Los Angeles-to-Phoenix off-road race (more commonly known as "The Cactus Derby") was another of the terrific classics from the sport's early days. In its 1914 edition, track racing legend and barnstormer Barney Oldfield entered the same Stutz racer he had piloted to fifth place in that year's Indianapolis 500.
One of the most intriguing figures of 1930's European Grand Prix Racing, Bernd Rosemeyer is memorialized with video and other content at this link. An odd but informative analysis of his accident is also available.