I currently teach engineering drawings at a major US University we currently use Technical Graphics by Meyers it is a great book. But if you are more interested in the rules and standards, I suggest you just purchase a copy of the standards your company follows if you understand the basics. Such as orthogonal views, projections, line styles, and basic dimension. This may be way more helpful.
If you need some good engineering books you can use this link http://ebookbrowsee.com/en/engineering-drawing-book-pdf for free books for engineering drawing. Hope it helps.
