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Science Paper
Vol. 237, Issue 6, 1939June 01, 1939 EDT

Notes on the Valentine Question

Alvin Leonard Lugn,
Earth sciences
https://doi.org/10.2475/ajs.237.6.433
American Journal of Science
Lugn, A. L. (1939). Notes on the Valentine question. American Journal of Science, 237(6), 433–438. https:/​/​doi.org/​10.2475/​ajs.237.6.433
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