Why so many books these days are available to download for free one chapter at a time. It just makes reading worse.
curl -O http://i.stanford.edu/~ullman/focs/ch[01-14].pdf
Still less than ideal since they aren't one file. But it's easy enough to merge together.
But if you want a full copy:
1. DownThemAll to pull down all of the .pdf links,
2. pdftk to merge them all into one file