I dusted off "Keys to Drawing" which is my favorite of the "learn by doing" series of books. I found it at Chavón´s library, and it is not just romanticism, it is a fabulous book, with clear and precise instructions, with exceptional results, if carried out step by step.
Another good book I use is "Drawing on the Right Side of the Brain". All exercises there are vital in order to learn how to draw from observation. It´s a somewhat heavy read, in my opinion, but this does not detract from the efficiency of its methodology.