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Online Tutorials for Health Science Library Resources: A Guide

Online tutorials and videos for PubMed, NCBI, ToxNet, Embase, Ovid Web of Science, Cochrane Databases, SAS, SPSS, Stata, Office, iWork, Boolean operators



  • AND combines two different terms (keywords) and retrieves only those records that contain both terms. The result is always narrower when you use AND.
  • OR combines two similar terms (keywords) and retrieves records that contain either one of them. The result is always broader when you use OR.
  • NOT excludes records containing the second term (keyword). Use NOT very carefully as it may eliminate what you really want.
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