Platinum

ChemGlobe: Platinum - Electronic, thermal, and steric data along with an isotope table.
partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/78.html

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

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

It's Elemental: Platinum - Basic physical and historical information.
education.jlab.org/itselemental/ele078.html

LANL: Platinum - Sources, properties, and uses.
periodic.lanl.gov/elements/78.html

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

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

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

Radiochemistry of Platinum - Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] <small>(October, 1961)</small>
lib-www.lanl.gov/cgi-bin/getfile?rc000037.pdf