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USGS Minerals Information: Nickel
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
minerals.usgs.gov/

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

ChemGlobe: Nickel
Electronic, thermal, and steric data along with an isotope table.
partisans.spurious.biz/

It's Elemental: Nickel
Basic physical and historical information.
education.jlab.org/

WebElements: Nickel
Extensive information on history, uses, occurrence, compounds, and properties of the element.
www.webelements.com/

Lenntech: Nickel
Physical data, chemical properties, health and environmental effects.
www.lenntech.com/

EnvironmentalChemistry.com: Nickel
Atomic structure, chemical and physical properties, and table of nuclides.
environmentalchemistry.com/

ChemicalElements.com: Nickel
Basic information, atomic structure, and isotopes.
www.chemicalelements.com/

Radiochemistry of Nickel
Full text of the monograph by L. J. Kirby (Hanford Atomic Products Operation, Richland, Washington). [PDF]
lib-www.lanl.gov/

LANL: Nickel
Sources, properties, and uses.
periodic.lanl.gov/