It's Elemental: Manganese - Basic physical and historical information. ChemicalElements.com: Manganese - Basic information, atomic structure, and isotopes. USGS Minerals Information: Manganese - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). EnvironmentalChemistry.com: Manganese - Atomic structure, chemical and physical properties, and table of nuclides. Lenntech: Manganese - Physical data, chemical properties, health and environmental effects. Wikipedia: Manganese - Properties of the element, including its history, applications, and characteristics. Radiochemistry of Manganese - Full text of the monograph by R. P. Schuman (Dept. of Chemistry, Robert College, Bebek P.K.8, Istanbul, Turkey).