Visual Elements: Vanadium - General and physical information, source, uses, key isotopes, and ionisation energies.
WebElements: Vanadium - Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Vanadium - Properties of the element, including its history, applications, and characteristics.
Radiochemistry of Vanadium - Full text of the monograph by J. L. Brownlee Jr. (Dept. of Chemistry, University of Michigan, Ann Arbor, Michigan). [PDF] (December, 1960)