It's Elemental: Indium - Basic physical and historical information. ChemicalElements.com: Indium - Basic information, atomic structure, and isotopes. USGS Minerals Information: Indium - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). EnvironmentalChemistry.com: Indium - Atomic structure, chemical and physical properties, and table of nuclides. Lenntech: Indium - Physical data, chemical properties, and health effects. Wikipedia: Indium - Properties of the element, including its history, applications, and characteristics. 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). WebElements: Indium - Extensive information on history, uses, occurrence, compounds, and properties.