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BACKHURST, J.R and RICHARDSON, J.F and HARKER, J.H (2001) UNSPECIFIED Butterworth Heinemann, Oxford. ISBN 978 075 064 950 x
BACKHURST, J.R and RICHARDSON, J.F and HARKER, J.H (2001) UNSPECIFIED Butterworth Heinemann, Oxford. ISBN 978 075 064 950 x