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Observations sur les phénomènes périodiques du règle animal, et particulièrement sur les migrations des oiseaux en Belgique, de 1841 à 1846.
"2. Bruxelles, Hayez, 1848, in-4°, 88 pp with many tables, published in the series ""Mémoires de l'Académie Royale de Belgique"", Vol. XXI, taken removed from a binding, unopened pages. The articles describes the habits of bats, butterflies, frogs, fish, and mostly migrating birds; it also contains 2 articles about periodical phenomena by Quetelet."
