Hi again Mike, I'm no relation to the family; I'm just one of the volunteers around here. Not sure it's necessary to talk by phone, I pretty much told you everything I found. Here's where I found them:
Google.com do a search with Arthur Burson in quotation marks, like this: "Arthur Burson"
You'll see a lot of links. The Ringling Bros link is there, as well as the movie links (lots of those) and the Gentry Brothers circus.
For the Emmett Kelly link, as well as a bunch more, go to the top of the Google search screen where it says "more" and select books. That will take you to the Google book search.
The Dallas Morning News info was from a subscription site, genealogybank.com. They have tons of old newspapers, including the DMN.
Just a brief search. He was apparently pretty famous, so there's lots out there.