While open access literature is free to users and is generally less expensive than traditional publishing methods, it isn't always free of charge to authors, who pay article publication fees, commonly called "page charges."
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Announcements for October 2013
The National Geographic Virtual Library brings together a complete archive of National Geographic magazine — every page of every issue — along with a cross-searchable collection of National Geographic books, maps, images and videos.
Staff at the University of Michigan defined the preservation levels to be associated with content submitted through mPach. Integrated and supplemental materials that meet existing HathiTrust specifications will be preserved at the bit level with format migration.