Rhenium

ChemGlobe: Rhenium - Electronic, thermal, and steric data along with an isotope table.
partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/75.html

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

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

It's Elemental: Rhenium - Basic physical and historical information.
education.jlab.org/itselemental/ele075.html

LANL: Rhenium - History, sources, properties, and uses.
periodic.lanl.gov/elements/75.html

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

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

Visual Elements: Rhenium - General and physical information, source, uses, key isotopes, and ionisation energies.
www.chemsoc.org/viselements/pages/rhenium.html

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

Radiochemistry of Rhenium - Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] <small>(March, 1961)</small>
lib-www.lanl.gov/cgi-bin/getfile?rc000051.pdf