The present volume III/48 is a supplement to the earlier volumes III/20, III/31 and III/39 of nuclear quadrupole resonance spectroscopy (NQRS) data of condensed substances. Compilation of the original data in the form of numeric database is continuing and the present supplement covers a period from August, 1995 to the end of 2006. There are 2,535 entries in this supplement and, therefore, the three volumes together provide about 14,400 data which have been published since the discovery of NQRS in 1951 until the end of 2006. Due to the large amount of data the present supplement is published...