The original text is indeed one of the best introductory texts on heterocyclic chemistry available. The major aromatic heterocycles are well-covered. The discussion of nonaromatic heterocycles is limited. BE ADVISED that the version sold by amazon as "new" is actually an educational print on demand from an electronic source. The text is legible, but the graphic quality is unimpressive. Some pages are cropped poorly. A well-worn used copy would be much better.