The Bibliographic Ontology (BIBO) is an ontology for the Semantic Web to describe bibliographic things like books or magazines.
[1][2] It is written in RDF and can be used as a citation ontology, as a document classification ontology, or simply as a way to describe any kind of document in RDF.
It has been inspired by many existing document description metadata formats, and can be used as a common ground for converting other bibliographic data sources.
The Chronicling America website at the Library of Congress uses BIBO to model newspaper pages and issues in the Linked Data views.
[3]