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PubMed is a freely availably resource that includes articles from MEDLINE and other life science journals for biomedical articles back to the 1940s. It's created by the U.S. National Library of Medicine (NLM). When accessing PubMed through the McMaster libraries, full-text articles can be retrieved.
The following introductory video tutorials on searching in PubMed are provided by the NCBI or National Centre for Biotechnology Information.