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Jonathan Zwart
Jonathan Zwart is the author of "Practical Astronomy with Your Calculator or Spreadsheet".
Books by Jonathan Zwart
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Practical Astrono...
Duffett-Smith, Peter
Digital download and online:
Practical Astrono...
Duffett-Smith, Peter
Electronic book text:
Practical Astrono...
Duffett-Smith, Peter
Paperback:
$41.99
Practical Astrono...
Duffett-Smith, Peter
Electronic book text: