Heterocyclic Compounds  edited by Robert C. Elderfield. 

 - New York  John Wiley  1957 
 - vii, 753p. 23cm. 
<br/><br/>Contents:V.6 six membered heterocycles containing two heteroatoms their benzo denratives. Elderfield, Robert C. 
<br/><br/><label>Dewey Class. No.: </label>547.59  / H59H