It's Elemental: Iron - Basic physical and historical information. ChemicalElements.com: Iron - Basic information, atomic structure, and isotopes. USGS Minerals Information: Iron - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). EnvironmentalChemistry.com: Iron - Atomic structure, chemical and physical properties, and table of nuclides. Lenntech: Iron - Physical data, chemical properties, health and environmental effects. Wikipedia: Iron - Properties of the element, including its history, applications, and characteristics. Radiochemistry of Iron - Full text of the monograph by J. M. Nielsen (Hanford Laboratories, Hanford Atomic Products Operation, Richland, Washington). WebElements: Iron - Extensive information on history, uses, occurrence, compounds, and properties of the element.