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  • Ulrich Herb
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  • heatmap_data 2

    over 4 years ago

  • Number of Open Access Journals per Country (2016-09-15)

    about 8 years ago

  • Number of Open Access Journals per Country (2015-09-02)

    about 9 years ago

  • Number of Open Access Journals per Country, August 2014

    about 10 years ago
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