The individual chapters are. There's links on the website (https://hesperian.org/books-and-resources/ https://hesperian.org/books-and-resources/). They are a no

The individual chapters are. There's links on the website (https://hesperian.org/books-and-resources/ https://hesperian.org/books-and-resources/). They are a non-profit, so please support them too. I downloaded all of the PDF's and will be buying the book as well.