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I recently read the The Story of Work: A New History of Humankind by Jan Lucassen that covered this (and all the other types) of labor in great, if also sleep-inducing depth.

If you like something a bit longer than this article about "unfree labour", want to know what "corvee labor" is, learn the difference between serfdom and slavery, and be depressed about how much slavery there still is in the world, this is a great book for you. for the book, for the in-depth review.

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