Environmental Chemistry
Environmental chemistry.com: Periodic Table Samarium
As the name of this site implies, this is a huge source of elemental information. You are likely to find whatever you need to know about elements here.
Wikimedia
Wikipedia: Samarium
This Wikipedia site contains a good deal of information on element 62, Samarium. Includes a definition of the element, characteristics, applications, history, biological role, occurence, and much more. There is also a chart and links...