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리뷰엉이 구독하기 https://goo.gl/CuJFLJ 참고 자료 및 서적 정보 https://www.britannica.com/science/Ordovician-Silurian-extinction https://www.proquest.com/docview/1440071324 https://www.nasa.gov/vision/universe/starsgalaxies/gammaray_extinction.html https://m.dongascience.com/news.php?idx=52599 https://www.researchgate.net/publication/223209616_Evidence_for_long-term_climate_change_in_Upper_Devonian_strata_of_the_central_Appalachians https://math.ucr.edu/home/baez/extinction/