The Pott. Co. Gen. Club has the marriage books from the time they started keeping track in the county.The books for the period that you're looking for have been transcribed and indexed.Write to them at:
Pottawatomie County Genealogy Club Suite 241-243 Masonic Office Bldg P.O. Box 3526 Shawnee, OK 74802-3526
They charge a small fee for lookups and copies.Good luck.