Try looking in "History of Centre and Clinton Counties Pennsylvania" by John Blair Linn. You can find it online. It gives much of the information you have mentioned, but may be helpful. I am also researching Adam Kessinger, however I am looking for a possible first wife. My G-G-Grandfather is George Kessinger, but he was born in 1815 years before Adam and Elizabeth were married (abt 1822). Good luck with the hunt!!