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Ratcliff, Brian, Philip Matthews, John Raffan, Helen Eccles, John Nicholson, David Johnson, David Acaster, and John Newman. AS Level and A Level: Chemistry / By Brian Ratcliff...[et.al.]. Cambridge : Cambridge University Press, 2004.

Ratcliff, Brian, et al. AS Level and A Level: Chemistry / By Brian Ratcliff...[et.al.]. Cambridge : Cambridge University Press, 2004.