Free Data Science Books
p-value.info
p-value.info
http://www-stat.stanford.edu/~tibs/ElemStatLearn/ or straight to the PDF at http://www.stanford.edu/~hastie/local.ftp/Springer/ESLII_pri...
http://www-nlp.stanford.edu/IR-book/
https://www.ics.uci.edu/~welling/teaching/273ASpring10/Intro...
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more info on Barber book mentioned in OP: https://news.ycombinator.com/item?id=4672930
http://www.reddit.com/r/MachineLearning/comments/i06a0/book_...