http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Includes information on agricultural pollution, aquifer, atmospheric deposition, bed sediments, catchment, clay minerals, decomposition, denitrification, erosion, floodplains, fertilisers, ground water discharge, groundwater flow, heavy metals, lakes, leaching, pesticides, rivers, sediment, toxicity, etc.