https://www.mappingthelives.org/bio/5093e07c-0199-4886-99b9-81bbd9261cfe
Adele Jacobsen (Oppenheim) (1870 - 1942) - Genealogy (geni.com)
Jacobson, Adele, 1870-1942 | The Center for Jewish History ArchivesSpace (cjh.org)
Gedenkbuch - Memorial book entry (bundesarchiv.de)