http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Solvent extraction of nickel and copper from laterite-ammoniacal leach liquors
by D.N. Nilsen, R.E. Siemens, and S.C. Rhoads.
Report of investigations (United States. Bureau of Mines) ; 8605