Six-membered nitrogen compounds with four condensed rings

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• Six-membered nitrogen compounds with three condensed rings
  gan: Allen, C F H
  Cyhoeddwyd: (1958)
• SIX MEMBERD HETROCYCLIC NITROGEN COMPOUNDS WITH FOUR CONDENSED RINGS VOL 2
  gan: ALLEN C F H
  Cyhoeddwyd: (1951)
• Heterocyclic compounds with three- and four-membered rings.
  gan: Weissberger, Arnold, 1898-
  Cyhoeddwyd: (1964)
• Compounds with condensed thiophene rings
  gan: Hartough, H D
  Cyhoeddwyd: (1954)
• THE CHEMISTRY OF HETEROCYCLIC COMPOUNDS: COMPOUNDS WITH CONDENSED THIOPHENE RINGS
  gan: HARTOUGH H D
  Cyhoeddwyd: (1954)