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__    __     ___    __    __    _____     ______  
\ \\ / //   / _ \\  \ \\ / //  |  ___||  /_   _// 
 \ \/ //   | / \ ||  \ \/ //   | ||__      | ||   
  \  //    | \_/ ||   \  //    | ||__     _| ||   
   \//      \___//     \//     |_____||  /__//    
    `       `---`       `      `-----`   `--`

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Text this: Geographic information analysis / David O'Sullivan and David J. Unwin.