Very Useful Notes from Paul Felix

I was delighted to see these in my blogger wall today. Very useful stuff! I wish I had this in art 28 :/

http://unofficialpaulfelix.blogspot.com/2011/08/paul-felix-notes.html
http://unofficialpaulfelix.blogspot.com/2011/08/blog-post.html
http://unofficialpaulfelix.blogspot.com/2011/08/pf-notes-pt-3.html
http://unofficialpaulfelix.blogspot.com/2011/08/pf-notes-pt-4.html