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texts of the lectures delivered at the conference organised by the Netherlands Inst. of Internat. Affairs on the occasion of its 25th anniversary 1970
1971
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1880 - 1930 ; peace, progress and prestige
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new research on centres of trade and coinage in Carolingian times ; proceedings of the First "Dorestad Congress", held at the National Museum of Antiquities Leiden, the Netherlands...
2010
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