Atlas of Fantasy by Post, J B (Z-lib.org)
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I have the hard copy of this book and I absolutely love it. I’ve pored over it time and again.

There are free Scribd downloaders, but they’re all annoying. You can search for them, but I’m not going to link to one. Otherwise Scribd will make you pay to download it. You can read it on Scribd for free with ads though.