For those of not aware, the New York State Library Digital Image Project has put the genealogical chart "Lineage from Johann Jacob Opp" on line at http://www.nysl.nysed.gov/scandoclinks/NY005423058.htm. It's a large PDF file, but it contains a lot of information. The chart was originally created by Jay G. Upp of Ohio in 1942. I've also created a GEDCOM based on the chart, which I've attached. Hopefully these resources will be a help to somebody!