Fresno Mineral Rights

My dad inherited mineral rights to land in Fresno County. I just know this because he told me and he gets checks from California Resources Corp. How do I get a copy of the deed?

It looks like Fresno County has an online records search. If you put his name in here, does anything come up? https://fresnocountyca-web.tylerhost.net/web/

The check stub probably has a legal description where the well is located, this may help narrow the search. Also, you might find something other than a deed that placed your father in title such as a probate order or an affidavit of heirship.

I think I have a legal description. How do I get the deed or proof of ownership? This is all new to me.