Re: Duvall Washington Co PA
I know that there are a couple Louis Duvalls listed on pg 502 of Beers' Commemorative Biographuical Record of Washington County, Pennsylvania. The younger one listed could be the father of the one born in 1862. This book is available on film from the LDS. The Beers volumes are not know for complete accuracy, especially regarding ancestoral lines, but may offer additional information to add to the collection.
The original was published: Chicago: J H Beers, 1893. It was republished by the Genealogical Society of Southwestrn Pennsylvania in 1976.
Oregon City, OR