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Pros
Google Scholar does include a very large amount of the scholarly literature.
In addition to scholarly journals it also includes things like preprints, conference proceedings, and other documents (these are usually called gray literature and many databases don’t include information about them).
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Cons
Consider the whole universe of scholarly literature. Specialized databases usually cover a specific section, e.g., the Agricola database covers agriculture and related fields.
Google Scholar only covers part of this scholarly universe but doesn’t tell us what’s included and what’s not included.
People who have done research on Google Scholar have found that it generally covers science and technology well, but does not cover social sciences and humanities as well. Also, Google Scholar does a better job finding online materials than those only published in print.
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