TY  - BOOK
AU  - Allen,C.F.H.
TI  - Six-membered heterocyclic nitrogen compounds with four condensed rings
U1  - 547.85 
PY  - 1951///
CY  - New York
PB  - Interscience Publishers
KW  - Organonitrogen compounds
KW  - Heterocyclic compounds
N1  - Includes bibliographies
ER  -