http://spurenimvest.de/2021/02/17/mayer-betty/
her husband https://www.joodsmonument.nl/nl/page/590448/roelof-frank
https://joodsbw.nl/cgi/b/bib/bib-idx?c=jbw;cc=jbw;lang=nl;q1=Apotheker;rgn1=beroep;type=boolean;view=reslist;sort=naam;fmt=long;page=reslist;start=5;size=1
Betty Maijer (Mayer) (c.1908 - d.) - Genealogy (geni.com)