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Edith Stein
German Jewish philosopher who converted to Roman Catholicism and became a Discalced Carmelite nun. She is canonized as a martyr and saint of the Catholic Church, and she is one of six co-patron saints of Europe. (Wikipedia)
Eine Untersuchung über den Staat
Edith Stein
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(1925) "Eine Untersuchung über den Staat", Jahrbuch für Philosophie und phänomenologische Forschung 7, pp.1-123.