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http://www.amazon.co.uk/How-Pass-Higher-Human-Biology/dp/144411073X/ref=sr_1_7?s=books&ie=UTF8&qid=1382187076&sr=1-7&keywords=Higher+human+Biologyhttp://www.amazon.co.uk/BrightRED-Revision-Higher-Human-Biology/dp/1906736235/ref=sr_1_1?s=books&ie=UTF8&qid=1382188045&sr=1-1&keywords=brightred+higher+human+biology
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