Information on old Ranger-Littleton royalties in Eastland county, TX

I have a certificate for The Ranger-Littleton Royalty located in Eastland County, Texas. It states there was a tract called the Littleton Tract in the John W. White survey, containing 317 acres. This document is dated 1919.

I am looking for information about this, or where I may begin some kind of research.

I, also, have a Certificate of Interest in something called the Grandpa Wiley Royalty, located in Cotton County, OK.

I would appreciate any information about either of these such as, how to begin research, or any history someone may have on them.

Thank you,

Tonia Benoist