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93 - History. Auxiliary sciences of history. Local History (4)
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00 - Prolegomena. Fundamentals of knowledge and culture. Propaedeutics (3)
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Unió Europea, Països de la (3)
004 - Computer science and technology. Computing. Data processing (2)
34 - Law. Jurisprudence (2)
628 - Public health engineering. Water. Sanitation. Illuminating engineering (2)
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