1
Published: Viöl, Nordfriesland : Hutten, 1997.
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2
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3
4
Published: Berchem : Vrij Historisch Onderzoek, 1995.
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5
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6
Published: Bonn : Pahl-Rugenstein, 1996.
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7
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9
Published: Tübingen : Grabert, 1994.
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