ChemGlobe: Praseodymium
- Electronic, thermal, and steric data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/59.html

LANL: Praseodymium
- History, uses, production, and properties.
- http://periodic.lanl.gov/elements/59.html

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

Lenntech: Praseodymium
- Physical data, chemical properties, health and environmental effects.
- http://www.lenntech.com/Periodic-chart-elements/Pr-en.htm

EnvironmentalChemistry.com: Praseodymium
- Atomic structure, chemical and physical properties, and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/Pr.html

ChemicalElements.com: Praseodymium
- Basic information, atomic structure, and isotopes.
- http://www.chemicalelements.com/elements/pr.html

It's Elemental: Praseodymium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele059.html

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