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- Article [PDF] about the WIRTH DNA Project, of which the main Bacharach line is a subset: Unkefer, Rachel et al., “Y-DNA and Documentary Research Collaboration Revewals Ancestral Origins” Avotaynu Magazine, Volume XXX, Number 1.
- Article [PDF] about the history and analysis of results of the Bacharach DNA Project: Unkefer, Rachel, “From Kansas to the Rhine: A DNA Journey through Europe’s Rabbinic Capitals,” Avotaynu Magazine, Volume XXIX, Number 4.
- Article [PDF] discussing an error made by Alexander Dietz in equating Gottschalk Bacharach and Gottschalk Kreuznach, arguing they are two different people (in German): Lewin, Rabbi Dr. A., “Die Gottschalke von Bacharach und Kreuznach,” Gemeindeblatt der Israelitischen Gemeinde Frankfurt, July 1933.
- Handout from Rachel Unkefer’s presentation at the 2013 IAJGS Conference in Boston: Research Methods in Nineteenth and Early Twentieth Century American Jewish Genealogy