http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Association of State Agricultural Experiment Stations of the North Central Region
National Atmospheric Deposition Program.
Data included in this report from the National Atmospheric Deposition Program, a research program sponsored by the Association of State Agricultural Experiment Stations of the North Central Region.
NADP data report of precipitation chemistry