- It's Elemental: Protactinium - http://education.jlab.org/itselemental/ele091.html
- Basic physical and historical information.
- ChemicalElements.com: Protactinium - http://www.chemicalelements.com/elements/pa.html
- Basic information, atomic structure, and isotopes.
- Visual Elements: Protactinium - http://www.chemsoc.org/viselements/pages/protactinium.html
- General and physical information, source, and key isotopes.
- EnvironmentalChemistry.com: Protactinium - http://environmentalchemistry.com/yogi/periodic/pa.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- LANL: Protactinium - http://periodic.lanl.gov/elements/91.html
- Basic information and history.
- ChemGlobe: Protactinium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/91.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Protactinium - http://www.webelements.com/webelements/elements/text/pa/key.html
- Extensive information on history, uses, occurrence, compounds, and properties.
- Radiochemistry of Protactinium - http://library.lanl.gov/cgi-bin/getfile?rc000046.pdf
- Full text of the monograph by H. W. Kirby (Mound Laboratory, Miamisburg, Ohio).
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