Six-membered heterocyclic nitrogen compounds with three condensed rings / C.F.H. Allen ; in collaboration with G.M. Badger ... [ et al. ]. Allen, C. F. H. (Charles Francis Hitchcock), 1895-1979. Organonitrogen compounds. Heterocyclic compounds. QD401 .A43 547.59 ALS Includes bibliographical references and index. New York : Interscience Publishers, 1958. 1958. 1958 Text xxii, 624 p. : eng The Chemistry of heterocyclic compounds ; v. 12 Chemistry of heterocyclic compounds ; v. 12.