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Separating tantalum and columbium by solvent extraction :HF- HCl-Diethyl ketone system
Columbium and tantalum:a materials survey
Preparation of columbium and tantalum by metallic reduction of their chlorides
X-ray spectrographic analysis for trace quantities of tantalum in columbium
Heat of formation of tantalum carbide
Extraction of tantalum and columbium from ores and concentrates by chlorination
Thermodynamic data for molybdenum carbide and tantalum carbide