That's quite an impressive collection you've got there. I am unabashedly envious.

Even for someone my age who started drawing at the age of four (in 1974) and entered the animation industry at the age of 28 (in 1998), the sight of such books always brings me back to the memories of my humble beginnings, and the struggles I faced in the four years before I entered the industry and became a traditional animator.

And in this age of PDFs and video tutorials online or on DVDs, books will always be my favorite medium of self-learning.