The file contains over 11 million citations dating back to the mid-1960's. Coverage is worldwide, but most records are from English-language sources or have English abstracts. See Journal LinkOut Providers for a list of web-based journals to which PubMed currently provides links. Publishers and other data providers are responsible for providing NLM with the links for each article through LinkOut, therefore the list of journals may change frequently. User registration, a subscription fee, or some other type of fee may be required to access the full text of articles for some journals.
Policies vary by provider and by journal.
Contact the journal publishers as noted on their individual web sites for specific access information. A full list of the PubMed journals is also available. The Batch Citation Matcher allows users to match their own list of citations to PubMed entries, using bibliographic information such as journal, volume, issue, page number, and year. This number can then be used to easily to link to PubMed. This service is frequently used by publishers or other database providers who wish to link from bibliographic references on their web sites directly to entries in PubMed.