I am glad that I can be of help. As you may know, I am president of the African American Historical & Genealogical Society of Pittsburgh. My main goal as a genealogist is to link as many of the African American families in southwestern Pennsylvania to those individuals who are seeking them. I know many people charge for their services but I don't.
I may have some more info on the Pangburns, so I will look for that, too.
I will be off from school on Thursday to Monday and will be in Washington and Canonsburg on Friday and Saturday. I plan to visit the court house and the library so I will see what else I can locate on your Pralls.