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I'll always support efforts at making education more accessible, but 90$ is pretty cheap for a textbook of this size. And it's a hardcover!

And it's available to read for free online, in its entirety, on the author's website.

It's hard to beat this proposition.

I'm seeing a price of $69.99 for the ebook. Maybe you're accessing that site through your University and they have a subscription or something?

> It is a new book, so my question is, is this title worth 90 bucks?

IMO, yes. I'll be ordering a copy. But "different strokes for different folks" and all that.