Molybdenum

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

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

ChemicalElements.com: Molybdenum - Basic information, atomic structure, and table of isotopes.
http://www.chemicalelements.com/elements/mo.html

WebElements: Molybdenum - Extensive information on history, uses, occurrence, compounds, and properties.
http://www.webelements.com/webelements/elements/text/Mo/key.html

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

Radiochemistry of Molybdenum - Full text of the monograph by E. M. Scadden (U.S. Naval Radiological Defense Laboratory, San Francisco, California). [PDF] <small>(January, 1960)</small>
http://library.lanl.gov/cgi-bin/getfile?rc000069.pdf

ChemGlobe: Molybdenum - Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/42.html

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

It's Elemental: Molybdenum - Basic physical and historical information.
http://education.jlab.org/itselemental/ele042.html

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

LANL: Molybdenum - History, sources, uses, and properties.
http://periodic.lanl.gov/elements/42.html