Parents

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Theobald Fischer research assistant 1892-1894 Universität Marburg
Albrecht Penck grad student 1898 Universität Marburg (Chemistry Tree)
 (Ein alpines Längsthal zur Tertiärzeit.)

Children

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Jacoba Brigitta Louisa Hol grad student 1916 Utrecht (GeograTree)
Jan Pieter Bakker grad student 1930 Utrecht