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* *German National Library of Economics \[ZBW\]*

_Preservation policy: guidelines for digital preservation at ZBW (2014{_}*) http://zbw.eu/en/about-us/key-activities/digital-preservation/preservation-policy/* (2015_) [http://zbw.eu/en/about-us/key-activities/digital-preservation/preservation-policy/\*|http://zbw.eu/en/about-us/key-activities/digital-preservation/preservation-policy/*]
* *Hathi Trust Digital Library*