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Britannica Nobel Prize: Protactinium

http://www.britannica.com/nobel/micro/483_52.html

Overview and basic data.

ChemicalElements.com: Protactinium

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

Basic information, atomic structure, and isotopes.

EnvironmentalChemistry.com: Protactinium

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

Atomic structure, chemical and physical properties, and table of nuclides.

It's Elemental: Protactinium

http://education.jlab.org/itselemental/ele091.html

Basic physical and historical information.

LANL: Protactinium

http://periodic.lanl.gov/elements/91.html

Basic information and history.

http://www.scescape.net/~woods/elements/protactinium.html

Data tables and historic information.

Radiochemistry of Protactinium

http://lib-www.lanl.gov/cgi-bin/getfile?rc000046.pdf

Full text of the monograph by H. W. Kirby (Mound Laboratory, Miamisburg, Ohio). [PDF]

Visual Elements: Protactinium

http://www.chemsoc.org/viselements/pages/protactinium.html

General and physical information, source, and key isotopes.

WebElements: Protactinium

http://www.webelements.com/webelements/elements/text/Pa/key.html

Extensive information on history, uses, occurrence, compounds, and properties.