FamilySearch Family Tree (
http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 27 Jun 2016), entry for (Gravin) Ida Cornelia Wilhelmina Van Der Duijn, person ID MF73-HYJ FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 27 Jun 2016), entry for (Gravin) Ida Cornelia Wilhelmina Van Der Duijn, person ID MF73-HYJ.