http://www.theriver.com/westlandpubn/gv-z.html#Z
www.hamrick.com/names
www.census.gov/genealogy
http://genealogy.tbox.com
www.slipnet.com/~jimstr

(Selner)
http://www.cris.com/~horvath/genealog.htm
http://www.cris.com/~horvath/selner.htm

(Zirbel Distribution)
http://www.hamrick.com/names/names.cgi?surname=zirbel&year=1990&type=html