http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Soil Survey Horizon Publication Corporation
Vols. for <1964-> published by Soil Survey Horizon Publication Corp.; <1989-> published in cooperation with the Soil Science Society of America.
Soil Science Society of America, 677 S. Segoe Rd., Madison, WI 53711