The Chemistry of Heterocyclic Compounds, Volume 2, Nitrogen with Four Rings C. F. Allen ISBN: 978-0-470-37521-1 Hardcover 359 pages January 1951 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