Alan R. Katritzky 
Handbook of Heterocyclic Chemistry [PDF ebook] 

Provides a one-volume overall picture of the largest of the classical divisions of organic chemistry, suitable for the graduate or advanced undergraduate student, as well as for research workers, both specialists in the field and those engaged in another discipline and requiring knowledge of heterocyclic chemistry. It represents Volume 9 of Comprehensive Heterocyclic Chemistry and utilizes the general chapters which appear in the 8-volume work. The highly systematic coverage given to the subject makes this the most authoritative one-volume account of modern heterocyclic chemistry available.