Produced by the Modern Language Association, the electronic version of the bibliography dates back to the 1920's and contains over 2.3 million citations related to literature and literary criticism, from more than 4,400 journals & series and 1,000 book publishers.
GreenFILE provides access to information on all aspects of human impact to the environment. Its collection of scholarly, government and general-interest titles includes content on global warming, green building, pollution, sustainable agriculture, renewable energy, recycling, and more.
PubMed comprises more than 27 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.