Internet Archive Scholar This full text search index includes over 25 million research articles and other scholarly documents preserved in the Internet Archive. The collection spans from digitized copies of eighteenth century journals through the latest Open Access conference proceedings and pre-prints crawled from the World Wide Web.
Institute of Education Studies and What Works Clearing House includes intervention reports, practice guides, resources and reviews of individual studies (randomised controlled trials, quasi-experimental design, regression discontinuity design, single case design)