Anyone know how to play Scribbage?

I was helping my Grandma clean out her trailer when we came upon this old game called Scribbage. I know that all the parts are there (A cup, 13 dice with letters on them, and a minute timer), but no instructions. Do any of you know how it is played?

Here is an Ebay auction with a picture.

From here:

Thank you very much! You just made my Grandmas day.