Use the command line to get the URLs for each chapter?

  Go to conqueringthecommandline.com/book
  Save the page source
  Insert the filename into the script below
  Alternatively, omit filename and pipe the source of the page to the script 

  Works with BSD sed as well as GNU sed; first lesson: portability

   a=$(printf '\004')
   sed 's/s3_url/'"$a"'&/' \
   |tr '\004' '\012' \
   |exec sed '
   s/\\u0026/\&/g;
   s/.*s3_url.:.//g;
   s/\".*//g;
   /https:.*Amz/!d;
   ' filename

I do not recommend this "book". Look at the hoops they make readers jump through. Try grymoire.com; much better and no Javascript required