http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
--v.1. book 1. Production. book 2. Distribution. 2d ed. 1902.--v.2. book 3. Exchange. 2d ed. 1919.--v.3. book 4. Economic progress. book 5. The economic functions of government. 1908.