During three rounds, we have obtained 167 spectra of radial velocity standards using the 2.15 m telescope at CASLEO. The stars were selected from the IAU list (American Ephemeris, 1987). The spectrograms were secured on Kodak II a-0 plates developed 15 m in Kodak D-76 having a dispersion of 29 Å/mm in the blue region. We present here preliminary sets of wavelengths for lines and blends in two different spectral types.