Iron

ChemGlobe: Iron - Electronic, thermal, and steric data along with an isotope table.
partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/26.html

ChemicalElements.com: Iron - Basic information, atomic structure, and isotopes.
www.chemicalelements.com/elements/fe.html

EnvironmentalChemistry.com: Iron - Atomic structure, chemical and physical properties, and table of nuclides.
environmentalchemistry.com/yogi/periodic/Fe.html

It's Elemental: Iron - Basic physical and historical information.
education.jlab.org/itselemental/ele026.html

LANL: Iron - History, sources, uses, and properties.
periodic.lanl.gov/elements/26.html

Lenntech: Iron - Physical data, chemical properties, health and environmental effects.
www.lenntech.com/Periodic-chart-elements/Fe-en.htm

USGS Minerals Information: Iron - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
minerals.usgs.gov/minerals/pubs/commodity/iron_&_steel/

Visual Elements: Iron - Image, general and physical information, source, uses, key isotopes, and ionisation energies.
www.chemsoc.org/viselements/pages/iron.html

Wikipedia: Iron - Properties of the element, including its history, applications, and characteristics.
en.wikipedia.org/wiki/Iron

Radiochemistry of Iron - Full text of the monograph by J. M. Nielsen (Hanford Laboratories, Hanford Atomic Products Operation, Richland, Washington). [PDF] <small>(August, 1960)</small>
lib-www.lanl.gov/cgi-bin/getfile?rc000015.pdf