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Earth : measuring its changes
by Barbara M. Linde Benchmark Education Company, c2011 書
It’s All in the Soil
Barbara Gannett Pearson Education Australia, 2005 書
Landslides
by Anne Ylvisaker Capstone Press, c2003 書
Erosion
Virginia Castleman Perfection Learning Corporation, c2004 書
Landslides and avalanches
Louise Spilsbury, Richard Spilsbury Hachette Children's Books, 2010 書
