H. W. van der Marel; Diatomaceous deposits at Lake Toba. Journal of Sedimentary Research ; 17 (3): 129–134. doi: https://doi.org/10.1306/D42692D3-2B26-11D7-8648000102C1865D
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Quaternary fresh-water diatomaceous deposits of Toba lake, northern Sumatra, are described. The lake is in a volcanic crater. The diatomite is of good quality, but inadequate transportation facilities prevent profitable exploitation.
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