Size of the (centrally managed) collection of e-books of Dutch public libraries, 2015-2021. Data from article Collectie van de digitale bibliotheek d.d. 28 July 2021, in <a rel="nofollow" class="external free" href="https://www.bibliotheeknetwerk.nl/artikel/collectie-van-de-digitale-bibliotheek">https://www.bibliotheeknetwerk.nl/artikel/collectie-van-de-digitale-bibliotheek</a>.
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