I found this book online and thought it might interest those whose ancestors owned cattle (or other animals?) in Keya Paha:
The Stockman's Brand Book, Keya Paha County, 1902
Click "View book" on the right on this page:http://www.biodiversitylibrary.org/bibliography/58754
The owner's names start on page 17. (I love Mrs. C. Butler's brand on page 18!)
There's also a General Index of owners at the back of the book.
Just thought I'd share...