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Here you go: https://b-ok.cc/book/5260524/55d50b . Z-lib (above) and Libgen are usually my go-to if I'm not sure I want to (or can't) purchase a book.

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is this legal?

No. But not all illegal things are immoral.

Limiting the acquisition of knowledge to people with sufficient economic means is immoral, because it means that more than half the worlds population has no means to move forward, even if they are motivated and intelligent.

Though discussing Sci-Hub and scientific articles, much of this argument applies as well to textbooks and publishing generally:

What the academic publishing industry calls "theft" the world calls "research": Why Sci-Hub is so popular

https://old.reddit.com/r/dredmorbius/comments/4p2rwk/what_th...

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