2021 Relativity
2021 Relativity
Dirk Pietersma(4 Mar 1906 - 19 Jan 1986)
Etje van Halen(24 Jan 1911 - 18 Oct 1994)
Grietje Pietersma
b.  
d.  
updated 3/27/21
copyright 2021 Jean Wisner Dupon