Peter Duffett-Smith
Peter Duffett-Smith has written at least 2 books. Their most popular book is Practical astronomy with your calculator or spreadsheet with 1 save with an average rating of -⭐.
Peter Duffett-Smith has written at least 2 books. Their most popular book is Practical astronomy with your calculator or spreadsheet with 1 save with an average rating of -⭐.
 Practical astronomy with your calculator or spreadsheet
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 Practical Astronomy with your Calculator Practical Astronomy with your Calculator
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