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Wikipedia: Erbium - Properties of the element, including its history, applications, and characteristics.
Erbium - Includes the history of the element, and a data sheet.
Visual Elements: Erbium - Image, physical information, key isotopes, and ionisation energies.
ChemGlobe: Erbium - Electronic, thermal, and steric data along with an isotope table.
LANL: Erbium - Basic information and history.
Lenntech: Erbium - Physical data, chemical properties, health and environmental effects.
WebElements: Erbium - Extensive information on history, uses, occurrence, compounds, and properties.
EnvironmentalChemistry.com: Erbium - Atomic structure, chemical and physical properties, and table of nuclides.
ChemicalElements.com: Erbium - Basic information, atomic structure, and isotopes.
It's Elemental: Erbium - Basic physical and historical information.

Erbium - Erbium (IPA: ) is a chemical element in the periodic table that has the symbol Er and atomic number 68. A rare, silvery, white metallic lanthanide; Erbium is a solid in its normal state.
Erbium-doped waveguide amplifier - An erbium-doped waveguide amplifier (EDWA) is an optical amplifier that uses a waveguide to boost an optical signal, analogous to an erbium-doped fiber amplifier (EDFA).
Erbium(III) chloride - Erbium(III) chloride is a violet solid used for the preparation of erbium metal.
Erbium(III) oxide - Erbium(III) oxide, a pink solid, is a compound of erbium sometimes used as a colouring for glasses and a dopant for optical fibres and optical amplifiers. It was partially isolated by Carl Gustaf Mosander in 1843, and first obtained in pure form in 1905 by Georges Urbain and Charles James.
Isotopes of erbium - Naturally occurring Erbium (Er) is composed of 6 stable isotopes, Er-162, Er-164, Er-166, Er-167, Er-168, and Er-170 with Er-166 being the most abundant (33.503% natural abundance).