Is selling books that teach drawing animate things permissible?

In the past, I bought books that teach how to draw anatomy, hands, faces, etc. Since I no longer will be using them (because I recently learned that drawing animate things is haram), I'm not really sure if selling them is permissible (seeing as the content of the books teaches how to draw animate things). The anatomy stuff isn't explicit in the sense that it details genitalia, though it does obviously have sketches of nude men and woman. That being said, their 'awrah is exposed, even if it isn't depicted in full detail. Just to clarify: these are educational books and clearly not pornography. Similar to how biology textbooks show nude bodies and such organs for teaching purposes. If selling is not permissible, should I donate or simply throw them away?