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I am also a Flickinger descendant through Peter F. and Mary Derr, Jacob Derr F. and Susan Witt, Jacob F. and Christina Wilhelm, Levi F. and Anna Newman, Elias F. and Julia Easter, Guy Gaylord F. and Mabel Anna Glass, Mabel F. (my mother) and Clifford Allen.
I have gotten most of my family information The Flickinger Family History, by Robert Elliott Flickinger, and censuses and other documentation. I have been unable to this point to find much documentation, other than from the book, on Peter, Jacob Derr, and Jacob.
If you are interested in exchanging information and sources, please contact me.