It looks good! In this website there are a lot of books of this type, all of them with CC license and similars (in fact, I think that you can suggest new books to be added, it would be a great idea to your friend's book in order to have a greater diffusion).
It looks good! In this website there are a lot of books of this type, all of them with CC license and similars (in fact, I think that you can suggest new books to be added, it would be a great idea to your friend's book in order to have a greater diffusion).
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