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80 - General questions relating to both linguistics and literature. Philology (11)
33 - Economics. Economic science (10)
82 - Literature (10)
61 - Medical sciences (9)
Ensenyament--Metodologia (9)
Arquitectura--Ensenyament (8)
Educació--Efecte de les innovacions tecnològiques (8)
Ensenyament universitari -- Innovacions tecnològiques (8)
35 - Public administration. Government. Military affairs (7)
504 - Threats to the environment (7)