Volume III/20 of the New Series is concerned with the experimental results of nuclear quadrupole resonance spectroscopy, a standard method of structural research, applied to solid substances. The results are important for molecular and solid state physics as well as for different branches of chemistry. Because of the large amount of data, volume III/20 had to be divided into three subvolumes, III/20a,b,c, the first two of which have appeared already. Subvolume III/20c which completes the volume, is presented herewith. The main contents of the volume are data on nuclear quadrupole resonance frequency, quadrupole coupling constant, asymmetry parameter, experimental method and temperature. The tables are accompanied by structure formulas and by graphs which show the dependence of frequencies and other properties on external parameters. The formulas and the graphs are compiled in the present subvolume c. For the user's convenience, special indexes of (a) gross molecular formulas, (b) chemical substance names, and (c) CAS Registry Numbers of all substances considered are added at the end of this subvolume.