History
Low estimate
High estimate
(HISTORY) 1. Leo MULLER: Die Festung Luxemburg, 1932, 2. Edouard M. KAYSER: Somewhere between Vienna and London ..., 1990, 3. Paul DOSTERT (et al.): Luxembourg in Lotharingia, 1993, 4. Jacques DOLLAR: Jean lAveugle à Crécy, 1991
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