http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Global distribution of moment-tensor focal mechanisms, 1981-1985
prepared by National Earthquake Information Center ; World Data Center A for Seismology ; compiled by Susan K. Goter.
"Department of the Interior. United States Geological Survey."--Upper left corner.