Dunn Benson Dragway & Broad Slab Speedway

I am in search of any historical information on the old Dunn Benson Dragway and Broad Slab Speedway. Any information is truely appreciated
updated by @mike-phillips: 12/05/16 08:51:02AM

I have an entry on Vinston Holmes who died at Dunn-Benson in 1990 driving his '68 Camaro Pro Stock car in my Drag Racer Deaths website. Any additional information you can add to my entry would be appreciated. The URL is: dragstripdeaths.webs.com/Thanks,Mel