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Frequency of Earthquakes for Selected Areas in the Western United States for the Period 1945-59
William Stephens TwenhofelR. A. BlackD. F. Balsinger
出版U.S. Department of the Interior, Geological Survey, 1961
URLhttp://books.google.com.hk/books?id=KzpcoIgBj1UC&hl=&source=gbs_api
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