KEMPEN-DE KRUYFF, E.G. VAN, Two letters written by Ernestine Geertruida (Tien) van Kempen-De Kruyff to O.L. van der Aa regarding the genealogy of De Munnick.
1961-1964, two handwritten letters by Ernestine Geertruida (Tien) van Kempen-De Kruyff to O.L. van der Aa, editor of Nederlands Patriciaat. De genealogy of the De Munnick family was published in 1961.