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\bibitem{Subramanian_etal1985} {\textquotedblleft}\textit{Chemical composition of river sediments from the Indian sub-continent}{\textquotedblright}. Subramanian V, Van {\textquoteright}t dack L, Van Grieken R, Chemical geology \textbf{48}, 271 (1985).   http://doi.org/10.1016/0009-2541(85)90052-X

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