http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
effectiveness of sand filters for the removal of specific viruses from water using selected cations as filter aids
Office of Water Research and Technology.
vii, 65 pages : illustrations, graphs ; 28 cm.
Completion report for OWRT project B-065-ALA.
WRRI bulletin (Auburn University. Water Resources Research Institute) ; no. 33