http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Issued in four volumes, the first two being devoted to authors and the last two to subjects.
Vols. for 1907/1916 cover vols. 1-10 of Chemical abstracts.
Continued by: Chemical abstracts. Collective index.