Allen, Charles Francis Hitchcock ,  1895- <br/><br/>
Six-membered heterocyclic nitrogen compounds with four condensed rin gs / 
[by] C. F. H. Allen, in collaboration with D. M. Burness [and o thers] 
 - New York :  Interscience Publishers,  1951. 
 - xiii, 345 p. ;  24 cm. 
 - The Chemistry of heterocyclic compounds, a series of monographs. .
<br/><br/>Includes bibliographial references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen organic compounds.<br/>Heterocyclic compounds.
<br/><br/><label>Dewey Class. No.: </label>547.85