PubMed Central® (PMC) is a free archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM). In keeping with NLM’s legislative mandate to collect and preserve the biomedical literature, PMC serves as a digital counterpart to NLM’s extensive print journal collection. Launched in February 2000, PMC was developed and is managed by NLM’s National Center for Biotechnology Information (NCBI).

PMC has material dating back to mid- to late-1800s or early 1900s for some journals.

PubMed indexes over 4,000 biomedical, nursing, dentistry and related journals, with over 21 million citations in MEDLINE, PreMEDLINE and related databases. PubMed is produced by the National Center for Biotechnology Information (NCBI) and provides links between article citations and relevant data in other NCBI ENTREZ databases, including Nucleotide and Protein Sequences, Protein Structures, Complete Genomes, Taxonomy, and others.

Journal Literature: 1950 to present Selected Online Books

The Encyclopedia of Life is a collaborative effort among several internationally known natural history institutions, with the goal of providing detailed information about all 1.8 million species of organisms on Earth via a single, free web portal. Content is synthesized from published literature and verified by volunteer scientists. Most of the content is text, although multimedia and interactive content is available for some entries.

Combines three citation indexes--Arts & Humanities, Science Expanded, and Social Sciences--which permit searching for articles that cite a known author or work, as well as searching by subject, author, journal, and author address. Covers 12,000+ journals.

1900 - (1900 - for Social Sciences; 1975 - for Arts & Humanities, 1900 - for Science)

Provides laboratory methods in bioinformatics, cell biology, molecular biology, cytometry, food analytical chemistry, human genetics, immunology, magnetic resonance imaging, microbiology, neuroscience, nucleic acid chemistry, pharmacology, protein science, stem cell biology and toxicology.

quarterly updates

PubMed indexes over 4,000 biomedical, nursing, dentistry and related journals, with over 21 million citations in MEDLINE, PreMEDLINE and related databases. PubMed is produced by the National Center for Biotechnology Information (NCBI) and provides links between article citations and relevant data in other NCBI ENTREZ databases, including Nucleotide and Protein Sequences, Protein Structures, Complete Genomes, Taxonomy, and others.

This version has links to full text available to UM affiliates.

1950 to present; journal literature only 1950 to present

Database of the names and associated basic bibliographical details of all seed plants. Product of the Royal Botanic Gardens (Kew), the Harvard University Herbaria, and the Australian National Herbarium. Formerly known as Index Kiwensis.

Provides cross-search of multiple databases: ISI Web of Science with Conference Proceedings (citation indexes), Current Contents Connect (tables of contents), Biosis Previews, and Medline. Also provides links (under "Additional Resources") to Journal Citation Reports, Scientific WebPlus, ISIHighlyCited.com, BiologyBrowser, Index to Organism Names, ResearcherID.com, and Science Watch.

1900 - (Varies by database.)

Key index to articles from major journals in all areas of science and technology. Use to find other articles citing a specific article (footnotes in reverse).

1900 -