https://www.mappingthelives.org/bio/8e7e2fde-76fe-463f-a69b-6ee5cfa740aa
https://freepages.rootsweb.com/~genealice/genealogy/wc01_384.html
https://www.alemannia-judaica.de/heppenheim_synagoge.htm
Leo Hirsch (1887 - 1942) - Genealogy (geni.com)