Best book for Atlas 12x36" lathe.

[bptactical]

To be honest, I haven't seen anything better than How to Run a Lathe. It is still considered the beginner's bible.

This booklet might be helpful for threading:
http://vintagemachinery.org/pubs/1617/3537.pdf

Yup, HTRAL is the consummate entry guide.
The US Navy Machine manual is good as well.