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Seimic Waves and Earth's Interior. An Introduction to Earthquakes & Earthquake Hazards. Pennsylvania State University Department of Geosciences. 2001-08-01 [2019-01-07]. (原始内容存档于2018-12-31) (美国英语).
Seimic Waves and Earth's Interior. An Introduction to Earthquakes & Earthquake Hazards. Pennsylvania State University Department of Geosciences. 2001-08-01 [2019-01-07]. (原始内容存档于2018-12-31) (美国英语).