Stamboom van Alle STEENIS/STEENES'en » Bronnen » "United States National Register of Scientific and Technical Personnel Files, 1954-1970," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KLWM-VVX : 12 December 2014), John Holt Steenis, Maryland, United States, Nov 1954; citing 1954 National Register of Scientific and Technical Personnel, 622629, National Archives at College Park, Maryland.

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"United States National Register of Scientific and Technical Personnel Files, 1954-1970," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KLWM-VVX : 12 December 2014), John Holt Steenis, Maryland, United States, Nov 1954; citing 1954 National Register of Scientific and Technical Personnel, 622629, National Archives at College Park, Maryland.


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