https://af.wikipedia.org/wiki/Frans_Lourens_Herman_Rumpff
Frans Lourens Herman Rumpff - Wikipedia
franshermanwikipedia
https://archives.dc.gov/Documents/Detail/clarke-henry-a.-to-rumpff-mary-emily/18864
CLARKE, Henry A. to RUMPFF, Mary Emily - Office of the Secretary - DC Office of Public Records and...
CLARKE, Henry A. to RUMPFF, Mary Emily, CLARKE, Henry A., RUMPFF, Mary Emily, Marriage Bureau, marriage, English