Question about land records

please see my discussion post done prior. Not sure yet how to do this and not familiar with website yet. Please excuse my error. Looking for copy of deed given by my grandmother Katherine Mosson Pitcher several decades ago for land including all or part of receiver plantation in southwestern Wilkinson Co. Adjoins Miss river and La. state prison. She retained 1/2 mineral rights to this property. Have some leased at present but would like to know how much more I have available for leasing.