Chris Ollerenshaw

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Wind-ups (Toybox Science)
Ollerenshaw, Chris; Triggs, Pat

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� 1.21

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Primary Science - Making It Work (International Series on Advances in Fracture,)
Ollerenshaw, Chris; Ritchie, Ron

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� 4.78

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Levers (Toybox Science)
Ollerenshaw, Chris; Triggs, Pat

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� 8.89

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Gears (Toy Box Science)
Ollerenshaw, Chris; Triggs, Pat; Millard, Peter

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� 9.98

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Electricity (Toy Box Science)
Ollerenshaw, Chris; Triggs, Pat; Allyn, Jon

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� 29.68

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