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Horst and Erna Petri - Wikipedia
Erna Petri: "Proving Oneself" in the East | Facing History & Ourselves
Women Show The Faces Of War In 'The Huntress' - NPR
Horst and Erna Petri - Wikiwand
The vast reach of the Nazi Holocaust - CBS News
Erna Petri | World War II Database
Women’s Role in Holocaust May Exceed Old Notions
Female role in Holocaust re-examined | The Seattle Times