http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Grade and tonnage relationships among copper deposits
1 online resource (52 unnumbered pages) : illustrations.
by D.A. Singer, Dennis P. Cox, and Lawrence J. Drew ; Geochemical exploration techniques applicable in the search for copper deposits / by Maurice A. Chaffee.
Geochemical exploration techniques applicable in the search for copper deposits
Geological Survey professional paper ; 907-A-B
Geology and resources of copper deposits