2021 Relativity
2021 Relativity
Hendrik Bierling(27 Aug 1872 - 1 Aug 1960)Willem Balkema
Dertje Bos(1874 - 1954)Anje Koning
m. 24 Aug 1922, Winsum, Groningen
Geert Bierling
Manna Balkema
b. 9 Apr 1898, Obergum, Groningen
d.
b. 1900, Baflo, Groningen
d.