Open Access Button auf Twitter: "We've now recorded 6600 paywalls worldwide! Help out using your #OpenAccess Button from http://t.co/QTLjtKgofO http://t.co/XlR2cvlj4S"

https://twitter.com/OA_Button/status/455386738785939456

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First saved: 2015-Aug-07 (Fri)
Last checked: 2015-Oct-27 (Tue), response 200