Close
I know that the topic is about books, but i supose i should give something back since the chelsea book "perspective for comic artist" that i found here was so helpful.

cgpersia.com

You can find artbooks in this site too (but the torrent section is far more than drawing). In the drawing field, I can recommend:

the perspective stuff by new masters or gary meyer
the shading planar surfaces by scott robertson
gesture and portrait drawing by proko
bone & muscle anatomy course "the structure of man" by riven phoenix

If in doubt, pick material from gnomon they are the safest in terms of quality.

the torrent registration seems to be open randomly, i haven't checked in a while but it says "open on 1 and 14 of each month". Try at least, the tracker is full of learning material.