http://general-terms.thesaurus.ekt.gr/vocabhttp://general-terms.thesaurus.ekt.gr/vocab?tema=12400sectors of production http://general-terms.thesaurus.ekt.gr/vocab?tema=12400 tertiary sector NT http://general-terms.thesaurus.ekt.gr/vocab?tema=12400 secondary production NT http://general-terms.thesaurus.ekt.gr/vocab?tema=12400 primary production NT