Aus dem Technical Bulletin der NLM: The Literature Databases page is a National Center for Biotechnology Information (NCBI) resource that pulls together various Entrez resources in the general literature arena. This page is available from the NCBI home page blue sidebar by clicking on Literature databases. The resources listed on the page range from links to the National Library of Medicine ® (NLM®) content collections such as PubMed®, PubMed Central®, OMIM™, and the Bookshelf, to links to technical specifications for the various DTDs developed by the NLM. Some introductory materials, such as the NCBI Handbook, are specifically listed, as well as explanations on the differences between the Journals database, PubMed, and the NLM Catalog.