Provides full-text access to over 800 journals covering aeronautics, astrophysics, chemistry, computer technology, geology, aviation, physics, archaeology, and materials science; as well as indexing and abstracts for more than 1,700 publications. (Some full-text)
"The National Science Digital Library provides high quality online educational resources for teaching and learning, with current emphasis on the sciences, technology, engineering, and mathematics (STEM) disciplinesboth formal and informal, institutional and individual, in local, state, national, and international educational settings."
PubChem is organized as three linked databases within the NCBI's Entrez information retrieval system. These are PubChem Substance, PubChem Compound, and PubChem BioAssay. PubChem also provides a fast chemical structure similarity search tool. More information about using each component database may be found using the links in the homepage.
GreenFILE is a free research database covering 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.