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Order a paper copy
and HTML versions of the book
are distributed free of charge. They are the most up to date.
If you’d rather have a physical copy, you can order a paper version
Note that the author receives 0% revenue from sales:
this is a non-profit, open-access project.
(price = cost of printing 60% + distributor fee 40% + author royalty 0%).
Let me know if you know a vendor who can deliver this book to some
geographic regions more cheaply.