Umbgrove, J. H. F. (1942). The Pulse of the earth. Nijhoff.
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Chicago Style (17th ed.) Citation
Umbgrove, Johannes Herman Frederik. The Pulse of the Earth. The Hague: Nijhoff, 1942.
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MLA (9th ed.) Citation
Umbgrove, Johannes Herman Frederik. The Pulse of the Earth. Nijhoff, 1942.
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