Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Ornithology_in_the_United_States> . }
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- Operation_Migration subject Category:Ornithology_in_the_United_States.
- Pacific_Seabird_Group subject Category:Ornithology_in_the_United_States.
- Category:American_ornithological_writers broader Category:Ornithology_in_the_United_States.
- Category:American_ornithologists broader Category:Ornithology_in_the_United_States.
- Category:Aviaries_in_the_United_States broader Category:Ornithology_in_the_United_States.
- Category:Birds_of_the_United_States broader Category:Ornithology_in_the_United_States.
- Category:Important_Bird_Areas_of_the_United_States broader Category:Ornithology_in_the_United_States.
- Category:Ornithological_organizations_in_the_United_States broader Category:Ornithology_in_the_United_States.