FREE Photography Book List (Updated)

Who doesn't love free?  I am a mass consumer of knowledge and I am always looking for a good deal.  Here is a list of Photography related books that are currently free or really cheap on Amazon (of course you need to have the Amazon Kindle Reader app on your phone or device to download them).  Some of the listed books may only be free if you have Kindle Unlimited (I do have this b/c the $9.99/month for free books is worth it to me).