Who owns this property?

How can I find out the current listed owner of property and mineral rites in Pittsburg County? My wife was given (through the will of her mother - which was given to the mother from her father (my wife's grandfather). We found one piece of property that was sold. We're trying to find out if she (my wife) still owns the other property. FYI, the property is located in Sec 15-T7N-18E (40 acres), 21-T2N-R15E (50 acres), and Sec 24-T9N-R16E (40 acres).

As for surface, if taxes are not paid each year they’d be sold for taxes. You can call the county assessor, tell them the legal and they will tell you who owns property.