Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Public_opinion_research_companies_in_the_United_States> . }
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- Gallup_(company) subject Category:Public_opinion_research_companies_in_the_United_States.
- Harris_Interactive subject Category:Public_opinion_research_companies_in_the_United_States.
- Leo_J._Shapiro_&_Associates subject Category:Public_opinion_research_companies_in_the_United_States.
- National_Opinion_Research_Center subject Category:Public_opinion_research_companies_in_the_United_States.
- Pew_Research_Center subject Category:Public_opinion_research_companies_in_the_United_States.
- Purple_Strategies subject Category:Public_opinion_research_companies_in_the_United_States.