Oceanography
http://my.hrw.com/sh/hzc/0030358329/student/ch13/sec01/qc01/hzc13_01_q01fs.htm
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http://scitutor.hrw.com/scitutor.jsp?Book=national&ChapterID=E13
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http://scitutor.hrw.com/scitutor.jsp?Book=national&ChapterID=E14
http://highered.mcgraw-hill.com/sites/0073016543/student_view0/index.html
http://highered.mcgraw-hill.com/sites/0072826789/student_view0/index.html