Updated 17 March 2024.
These are books I'm always recommending, headed by what may be the most important of them, The NATURAL WAY TO DRAW. A good many more resources including articles, 3D models, anatomy plates and art education material may be found at http://www.ingetang.com/praxis/ I highly recommend exploring the site-map. Note that I am updating the lists with new books and materials all the time, so check back periodically.
Kimon Nicholaides THE NATURAL WAY to DRAW (2 parts) http://www.ingetang.com/praxis/the-natural-way-to-draw-intro/
Mayer, Ralph M., THE ARTIST'S HANDBOOK OF MATERIALS AND TECHNIQUES, https://archive.org/details/