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Science Paper
Vol. 238, Issue 8, 1940August 01, 1940 EDT

Periodicity in Terrestrial Processes

Johannes Herman Frederik Umbgrove,
Earth sciences
https://doi.org/10.2475/ajs.238.8.573
American Journal of Science
Umbgrove, J. H. F. (1940). Periodicity in terrestrial processes. American Journal of Science, 238(8), 573–576. https:/​/​doi.org/​10.2475/​ajs.238.8.573
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