•奥德姆研究所 “•奥德姆研究所提供了服务人员管理,归档,和保护社会科学数据。”Odum Public Opinion Data includes the Community Indicators Survey, the Harris collection (includes Harris polling and other sources), the NNSP (National Network of State Polls), Southern Regional Public Opinion, and《今日美国》。
Roper民意研究中心 成立于1947年,参赛者中心”拥有数据可以追溯到1930年代,来自超过100个国家。”The collection now includes "over 22,000 datasets from more than 100 countries, and over 650,000 questions in iPOLL."