2021 Relativity
2021 Relativity
Sjoerd de Jong(1 Feb 1855 - aft 1916)
Janke Dupon(21 Feb 1859 - 28 Feb 1916)
Gerben de Jong
b. 25 May 1881
d.  
updated 3/27/21
copyright 2021 Jean Wisner Dupon