http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
operation and maintenance of wastewater treatment facilities
Office of Water and Hazardous Materials.
Supplement to and updating and replacing pages 31-46 of Federal guidelines, Design, operation and maintenance of waste water treatment, 1970, United States, Federal Water Quality Administration.