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Maths Quest
by C. Burgess, L. Spavin, P. Thorburn
Solution Equilibra
by F. R. Hartley, R. M. Alcock, C. Burgess
by C. Burgess, P. Thorburn, L. Spavin
Solution Equilibria
by F. R. Hartley, C. Burgess, R. M. Alcock