ChemicalElements.com: Copper - Basic information, atomic structure, and table of isotopes. Copper - Properties and applications along with photographs and chemical formulas of occurrences. It's Elemental: Copper - Basic physical and historical information. USGS Minerals Information: Copper - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). EnvironmentalChemistry.com: Copper - Atomic structure, chemical and physical properties, and table of nuclides. Wikipedia: Copper - Properties of the element, including its history, applications, and characteristics. Radiochemistry of Copper - Full text of the monograph by F. F. Dyer (Oak Ridge National Laboratory, Oak Ridge, Tennessee). WebElements: Copper - Extensive information on history, uses, occurrence, compounds, and properties of the element.