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The plan is to put up a draft of the whole book sometime in 2018(?).
Below is a PDF of the book with the chapters that are now stable.
Draft of the book (Dec 18, 2018)
Warning:There are some dangling/missing links.
Listed below are previous versions of the book (in case you need an older version):
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.