- ChemicalElements.com: Copper - http://www.chemicalelements.com/elements/cu.html
- Basic information, atomic structure, and table of isotopes.
- Copper - http://nautilus.fis.uc.pt/st2.5/scenes-e/elem/e02900.html
- Properties and applications along with photographs and chemical formulas of occurrences.
- It's Elemental: Copper - http://education.jlab.org/itselemental/ele029.html
- Basic physical and historical information.
- USGS Minerals Information: Copper - http://minerals.usgs.gov/minerals/pubs/commodity/copper/
- Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- Visual Elements: Copper - http://www.chemsoc.org/viselements/pages/copper.html
- Image, general and physical information, source, uses, key isotopes, and ionisation energies.
- EnvironmentalChemistry.com: Copper - http://environmentalchemistry.com/yogi/periodic/cu.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Copper - http://www.lenntech.com/periodic-chart-elements/cu-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Copper - http://en.wikipedia.org/wiki/copper
- Properties of the element, including its history, applications, and characteristics.
- LANL: Copper - http://periodic.lanl.gov/elements/29.html
- History, properties, sources, and uses.
- ChemGlobe: Copper - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/29.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Copper - http://www.webelements.com/webelements/elements/text/cu/key.html
- Extensive information on history, uses, occurrence, compounds, and properties of the element.
- Radiochemistry of Copper - http://library.lanl.gov/cgi-bin/getfile?rc000048.pdf
- Full text of the monograph by F. F. Dyer (Oak Ridge National Laboratory, Oak Ridge, Tennessee).
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