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birgburg: Bergen, 1886
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birgburg: Bergen, 1886
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birgburg: Bergen, 1886
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birgburg: Vienna, 1870
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birgburg: Vienna, 1870
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birgburg: Vienna, 1870
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birgburg: Vienna, 1870
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birgburg: Vienna, 1870
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birgburg: Vienna, 1870
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birgburg: Leiden, 1759
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birgburg: Leiden, 1759
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birgburg: Leiden, 1759
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birgburg: Leiden, 1759
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birgburg: Leiden, 1759
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birgburg: Leiden, 1759
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birgburg: Leiden, 1759
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birgburg: Leiden, 1759
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birgburg:
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birgburg:
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birgburg: Leyden jar
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birgburg: Museum of natural history
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birgburg: Museum of natural history
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birgburg: Museum of natural history
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birgburg:
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birgburg:
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birgburg: Christie
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birgburg: Fooling around
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birgburg:
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birgburg:
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birgburg: