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Xarxes (Matemàtica) (3)
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32 - Politics (2)
33 - Economics. Economic science (2)
373 - Kinds of school providing general education (2)
376 - Education, teaching, training of special groups of persons. Special schools (2)
576 - Cellular and subcellular biology. Cytology (2)
616.89 - Psychiatry. Pathological psychiatry. Psychopathology (2)
94 - General history (2)
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