Farey Tales, the Lifeguard and Other Mathematics Investigations for Higher-Level GCSE
by Tony Croft, Derek Hart
ISBN 13: 9780748701490
Format: Spiral-bound (144 pages) Publisher: Stanley Thornes Published: 01 Jul 1990
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Before The Dead Walked
by Derek Hart,David Burke
ISBN 13: 9780359225859
Format: Paperback (242 pages) Publisher: Lulu.com Published: 15 Nov 2018