Peter Duffett-Smith

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Practical Astronomy with your Calculator
Duffett-Smith, Peter

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� 5.14

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Astronomy with your Personal Computer
Duffett-Smith, Peter

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� 6.68

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Astronomy Personal Computer 2ed
Duffett-Smith, Peter

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� 11

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Easy PC Astronomy with floppy disk
Duffett-Smith, Peter

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� 16.29

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Practical Astronomy with your Calculator or Spreadsheet
Duffett-Smith, Peter

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� 27.09

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Practical Astronomy with your Calculator
Duffett-Smith

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� 6.98

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Practical Astronomy Calculator 2
Duffett-Smith

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� 5.38

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