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DOAJ Directory of Open Access Journals
Available from 2000.
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Freely available EZB journals
Available from 2000 volume: 1 issue: 1.
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Institute of Physics Open Access Journal Titles
Available from 2000 volume: 1 issue: 1 until 2015 volume: 16 issue: 6.
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PubMed Central
Available from 2008 volume: 9.
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Taylor & Francis Open Access
Available from 2013 volume: 14 issue: 1.