Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:1961_in_the_environment> . }
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- Antarctic_Treaty_System subject Category:1961_in_the_environment.
- Arms_Control_and_Disarmament_Act_of_1961 subject Category:1961_in_the_environment.
- Oil_Pollution_Act_of_1961 subject Category:1961_in_the_environment.
- Category:Protected_areas_established_in_1961 broader Category:1961_in_the_environment.