Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of International Ozone Day-en#Sense
Journée internationale de la protection de la couche d'ozone-fr#Sense
Dia Internacional da Preservação da Camada de Ozono-pt#Sense
International Day for the Preservation of the Ozone Layer-en#Sense