From the record
“Bonneville Speedway is an area of the Bonneville Salt Flats northeast of Wendover, Utah in the United States, that is marked out for motor sports. It is particularly noted as the venue for numerous land speed records.”
Wikipedia article Bonneville Speedway, CC BY-SA 4.0.
One of 29 National Register listings published here for Tooele County · listed in 1975 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service