Indium

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

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

Visual Elements: Indium - Image, appearance, uses, physical information, and ionisation energies.
http://www.chemsoc.org/viselements/pages/indium.html

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

It's Elemental: Indium - Basic physical and historical information.
http://education.jlab.org/itselemental/ele049.html

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

ChemGlobe: Indium - Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/49.html

Radiochemistry of Indium - Full text of the monograph by Duane Neuman Sunderman (Battelle Memorial Institute, Columbus, Ohio) and Charles William Townley (Battelle Memorial Institute, Columbus, Ohio). [PDF] <small>(May, 1960)</small>
http://library.lanl.gov/cgi-bin/getfile?rc000020.pdf

LANL: Indium - History, sources, properties, and uses.
http://periodic.lanl.gov/elements/49.html

ChemicalElements.com: Indium - Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/in.html

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