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\bibitem{Subramanian_etal1987} {\textquotedblleft}\textit{Transport and fractionation of Pb in river sediments from the Indian sub-continent}{\textquotedblright}. Subramanian V, Van Grieken R, Van {\textquoteright}t dack L, Journal of the Geological Society of India \textbf{30}, 217 (1987)

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