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Curiously, the full text of the book is prominently posted online in multiple places, for example:

This could be because the copyright has expired almost everywhere.

He wrote it in 1948, which is post Mickey so it is still under copyright.

Not that it matters, as you pointed out.

It's still under copyright in the US and UK, but not in Canada, where the copyright was "only" the author's life plus 50 years.