Reading: Free online resources June 2014

I need to say, my last obsession is NLP. After I came through basics of ML/DM techniques I challenge my self in NLP Kaggle.com contest about Sentiment analysis. So, if you are interested about free (as usual of course) basic sources  for this topic, be my guest:

• Natural Language Annotation for Machine Learning by James Pustejovsky, Amber Stubbs
• Natural Language Processing with Python by Steven Bird, Ewan Klein, Edward Loper
• Python Text Processing with NLTK 2.0 Cookbook by Jacob Perkins
• Taming Text by Grant S. Ingersoll, Thomas S. Morton, Andrew L. Farris
• and many others...

Unfortunately I have found that 1st one is not completely available, just first 4 chapters, but as intro it is good enough.