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- Available from 07/01/1996.
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AgZines Free
- Available from 1995.
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DOAJ Directory of Open Access Journals
- Available from 1995.
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MasterFILE Premier
- Available from 07/01/1996.
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PubMed Central
- Available from 1995 volume: 1.
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- Available from 1995 volume: 1.
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ROAD: Directory of Open Access Scholarly Resources
- Available from 1995.
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