http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Catalogus catalogorum (predominantly post-1900)
part III of the private library of Hans P. Kraus : with a supplement to parts I and II
Part I published under title: From Trithemius to Proctor; part II published under title: Bibliography and reference books after 1900.