Volume III/31 continues the compilation of nuclear quadrupole resonance spectroscopy data of solid substances which started in with volume III/20 in 1987 covering the literature from the beginning of nuclear quadrupole resonance spectroscopy in 1951 to 1982 and containing the data for 8000 substances in the solid state, distributed among three subvolumes III/20 a, b, and c. Volume III/31 covers the literature published in the period from the end of 1982 through the end of 1989. Included are the data for substances studied for the first time, as well as data for substances already present in the previous volume III/20 if the data published there could be completed or improved by new studies. In total there are 2500 substances in volume III/31, showing the scope and significance of nuclear quadrupole resonance spectroscopy up to recent times. The organization and representation of the data are the same as in the previous volume III/20. A few, minor modifications are explained in the introduction (chapter 1). Volume III/31 can be consulted without recourse to its predecessor because the complete introduction and general tables are repeated from III/20. The present subvolume III/31a will be followed soon by subvolume III/31b.