Johannes Herman Frederik Umbgrove

Johannes Herman Frederik Umbgrove Johannes Herman Frederik Umbgrove HFRSE (5 February 1899 Hulsberg (Limburg) – 14 June 1954 Wassenaar), called in short Jan Umbgrove, was a Dutch geologist and earth scientist. Provided by Wikipedia
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    The pulse of the earth /

    The pulse of the earth / by Umbgrove, Johannes Herman Frederik, 1899-1954

    Published 1971

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