http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Full scale operation of plug flow activated sludge systems
National Environmental Research Center (Cincinnati, Ohio)
Environmental Quality Research and Development.
by Carl Beer, Leo J. Hetling [and] Lawrence K. Wang.
Technical paper (New York (State). Department of Environmental Conservation) ; 42