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Lenntech: Lawrencium

http://www.lenntech.com/Periodic-chart-elements/Lr-en.htm

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EnvironmentalChemistry.com: Lawrencium

http://environmentalchemistry.com/yogi/periodic/Lr.html

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ChemicalElements.com: Lawrencium

http://www.chemicalelements.com/elements/lr.html

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It's Elemental: Lawrencium

http://education.jlab.org/itselemental/ele103.html

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WebElements: Actinium

http://www.webelements.com/actinium/

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