VON SIBIRIEN. W. A. Obrutschew, Abhandlungen zur Praktischen Geologie und Bergwirtschaftslehre, vol. 6. Berlin, 1926. Published by Wilhelm Knapp, Halle (Saale). 63 pages. Price R. M. 5.50

WISSENSCHAFTEN. P. Groth. VI+266 pages. Julius Springer. Berlin, 1926.

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