<a href="https://en.wikipedia.org/wiki/Registry_of_Open_Access_Repositories" class="extiw" title="en:Registry of Open Access Repositories">ROAR</a> growth curve for open access repositories, Aug 1 2011
<a href="//commons.wikimedia.org/wiki/User:Harnad" title="User:Harnad">Harnad</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>