LANL: Samarium
Sources, properties, isotopes, and uses.
http://periodic.lanl.gov/elements/62.html

It's Elemental: Samarium
The Element Samarium - Basic Physical and Historical Information
http://education.jlab.org/itselemental/ele062.html

Visual Elements: Samarium
Image, source, uses, physical information, and key isotopes.
http://www.chemsoc.org/viselements/pages/samarium.html

ChemicalElements.com: Samarium
Basic information, atomic structure, and isotopes table.
http://www.chemicalelements.com/elements/sm.html

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

ChemGlobe: Samarium
The chemical element [Sm] - Samarium - Datasheet
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/62.html

EnvironmentalChemistry.com: Samarium
Comprehensive information for the element Samarium – Sm is provided by this page including scores of properties, element names in many languages, most known nuclides and technical terms are linked to their definitions.
http://environmentalchemistry.com/yogi/periodic/Sm.html

Lenntech: Samarium
chemical properties, health and environmental effects of samarium
http://www.lenntech.com/Periodic-chart-elements/Sm-en.htm

Shin-Etsu Magnetics, Inc.
Manufactures the rare earth, sintered neodymium and samarium-based magnets.
http://www.shinetsumagnetics.com/

Electron Energy Corp
Custom rare earth magnetic design and assembly. Leading provider of DFARS and ITAR compliant samarium cobalt magnet systems.
http://www.electronenergy.com