From April 1955
From July 1955....
Here are some CB newspaper articles I found when I was researching that incident Bobby Matson mentioned, that included my father, Dutch.
also from CB newspapers, summer race season 1958.
I am enclosing this 1960 death notice; there were many different newspapers' ''Sports Page'' mentions like this when he died, but this one from Des Moines, Ia. mentions his tie to PLAYLAND in Council Bluffs specifically.