http://dewey.info/scheme/e22/
600
Tecnologia
600
Tecnologia
610
Medicina e saúde
620
Engenharia
630
Agricultura
640
Gerenciamento da casa e família
650
Gerenciamento e relações públicas
660
Engenharia química
670
Manufatura
680
Manufatura para usos específicos
690
Construção
Dewey Decimal Classification: Summaries
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