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ABI/INFORM Collection
Available from 01/01/2013.
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ABI/INFORM Global
Available from 01/01/2013.
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DOAJ Directory of Open Access Journals
Available from 1972.
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EBSCOhost Academic Search Elite
Available from 01/01/1999.
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EBSCOhost CINAHL with Full Text
Available from 01/01/2006.
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Publicly Available Content Database
Available from 01/01/2013.
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PubMed Central
Available from 1972 volume: 1.