I have a note from my early records of Johannes Dubendorf(fer);lived in Lancaster Co.PA;arr.in America on ship"William & Mary from Rotterdam,1727.Sorry,no source! I'm hoping to connect him to my 3rd GGF.Michael Diffenderffer,1744-1809,m 22 Aug 1773 Dorothy ? 1756-1829. His son John D.b 1775, Balt. MD, m Catherine Rogers 1788-1818. John was 1st of 9 kids. I haven't any proof yet,but Balt. should be a gold mine. Pls drop me an e-mail. Maybe we can help each other.