Rotterdam, Netherlands
- References (3)
- 1930 Marriage / Union: Pieter Nicolaas Kalkman & Marie Margarete Gretel Kropp (m. May 28th, 1930 )
- 1995 Individual: Marie Margarete Gretel Kropp (d. 1995 )
- 1995 Individual: Pieter Nicolaas Kalkman (d. Apr 30th, 1995 )