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Maths books
Algebraic Number Theory and Fermat's Last TheoremAlgebraic Number Theory and Fermat's Last Theorem by Ian Stewart
Buy new: £39.88 / Used from: £27.99
Adventures in Group Theory: Rubik's Cube, Merlin's Machine and Other Mathematical ToysAdventures in Group Theory: Rubik's Cube, Merlin's Machine and Other Mathematical Toys by David Joyner
Buy used from: £19.15
On Quaternions and OctonionsOn Quaternions and Octonions by John H. Conway
Buy new: £28.03 / Used from: £21.71