ChemGlobe: Terbium ChemGlobe: Terbium: Electronic, thermal, and steric data along with an isotope table. (Terbium) http://www.vcs.ethz.ch/chemglobe/ptoe/_/65.html
Lenntech: Terbium Lenntech: Terbium: Physical data, chemical properties, health and environmental effects. (Terbium) http://www.lenntech.com/Periodic-chart-elements/Tb-en.htm
WebElements: Terbium WebElements: Terbium: Extensive information on history, uses, occurrence, compounds, and properties. (Terbium) http://www.webelements.com/webelements/elements/text/Tb/key.html
EnvironmentalChemistry.com: Terbium EnvironmentalChemistry.com: Terbium: Atomic structure, chemical and physical properties, and table of nuclides. (Terbium) http://environmentalchemistry.com/yogi/periodic/Tb.html
Terbium Terbium: Data tables and historic information. (Terbium) http://www.scescape.net/~woods/elements/terbium.html