Books
Low estimate
(Directory) 1. Fire service: 1st Supplement to the official directory of telephone subscribers, August 1931, Luxembourg Nr. 22-40, 1931. 2. Peck-Villchen: Fuesends Kalenner, 1952. 4. Leo Muller: Die Festung Luxemburg, Streifzüge aus Luxemburgs Geschichte und Luxemburgs Gegenwart, 1932.
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