Provides online access to ASTM books, papers, journal articles, standards, and Special Technical Publications (STPs). ASTM Digital Library covers a broad range of engineering disciplines including: aerospace, biomedical, chemical, civil, environmental, geological, health and safety, industrial, materials science, mechanical, nuclear, petroleum, soil science and solar engineering.
PubMed is a project developed by the National Center for Biotechnology Information (NCBI) at the National Library of Medicine (NLM), located at the National Institutes of Health (NIH)--Overview. NLM's search service to access the 9 million citations in MEDLINE and Pre-MEDLINE (with links to participating on-line journals), and other related databases --Home page.
"Scopus is the world's largest abstracts database of 13,450 titles from more than 4,000 international publishers with access to over 25 million abstracts (going back to 1966)." Full-text is included for some citations.