A table is presented listing 204 polynuclear heterocyclic aromatics, with three or more aromatic rings, according to increasing values in millimicrons of the longest wavelength absorption band. Structural formulas, wavelengths in millimicrons of additional absorption bands, solvents, and literature references through 1958 also are given This table is supplemental to a previous table listing 408 polycyclic aromatic hydrocarbons, with three or more aromatic rings.

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