The Chemistry of Heterocyclic Compounds, Volume 12, Six Membered Heterocyclic Nitrogen Compounds with Three Condensed Rings C. F. Allen ISBN: 978-0-470-37851-9 Hardcover 646 pages January 1958 US $545.00 Add to Cart This price is valid for United States. Change location to view local pricing and availability. This is a Print-on-Demand title. It will be printed specifically to fill your order. Please allow an additional 5-6 days delivery time. The book is not returnable. Other Available Formats: E-book