https://mappingthelives.org/bio/0146d22d-de65-4901-b328-ff66e550c041?language=en
https://www.szukajwarchiwach.gov.pl/en/jednostka/-/jednostka/22701613
#holland POR https://archief.amsterdam/indexen/deeds/6381c30b-085e-4444-a580-3278301d7dfc?person=99e87e33-a2d2-2bb2-e053-b784100a6a2e
https://www.ancestry.com/genealogy/records/alfred-kalischer-24-hrwy2x