Roper Center Public Opinion Archives or iPoll is a comprehensive, up-to-date and the largest archives of US public opinion information.It is organized at the question level, providing the tools to sift through nearly a half million questions asked on national public opinion surveys, 1935 to present. The membership also includes on demand access to the full datasets required to conduct bivariate and multivariate analyses on archived surveys using RoperExpress.
The Center for Immigration Studies is an independent, non-partisan, non-profit, research organization. Their mission is to provide reliable information about the social, economic, environmental, security, and fiscal consequences of legal and illegal immigration into the United States. A rich resource, factual and timely.