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Re:Procedural Content Generation in Games by falcor84 on Wednesday July 09, 2014 @11:01AM (#8009969)
I couldn't find a single pdf version of the book, and I failed to find the copyright to know whether I'm allowed to upload such a version myself. In any case, the following two lines are what I used to unite the files using bash and the pdfunite utility (available as the poppler-utils package in ubuntu) for my own personal use.

    for i in {1..12}; do wget `printf "http://pcgbook.com/wp-content/uploads/chapter%02d.pdf" $i`; done
    pdfunite chapter*.pdf ProceduralContentGenerationInGames.pdf
Re:Procedural Content Generation in Games by packetslave on Wednesday July 09, 2014 @03:49PM (#8011847)
or on OSX:

    for i in {1..12}; do wget `printf "http://pcgbook.com/wp-content/uploads/chapter%02d.pdf" $i`; done
    "/System/Library/Automator/Combine PDF Pages.action/Contents/Resources/join.py" -o ProceduralContentGenerationInGames.pdf chapter*.pdf