Automotive
And tells some hilarious stories in it too... she was sued for knocking over a porta potty with a hot air balloon by the woman in it at the time,
When she won the Miss Pure Oil Firebird, she got free gas for a year
https://books.google.com/books?id=mPwYDQAAQBAJ&pg=PA7&dq=Linda+Vaughn:+The+First+Lady+of+Motorsports&hl=en&sa=X&ved=0ahUKEwiw85yx9ajRAhWpxlQKHZ9pBZQQ6AEIGjAA#v=onepage&q&f=false