http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Groundwater in the global water cycle -- Geography of the world's groundwater systems -- Groundwater resources -- Groundwater withdrawal and use -- Growing needs for groundwater resources management interventions -- Groundwater resources management -- Final comments -- Statistics on renewable water resources -- by country -- Some data on the world's mega aquifer systems -- Brief description of the global groundwater regions -- Groundwater abstraction estimates by country.