For everyone concerned with the technology and applicationof metals and alloys and with the development of newmetallic materials, a detailed knowledge of phase equilibriais indispensable. Also, information on the thermodynamicaland crystallographical data of the systems underinvestigation is essential, and often metastable crystallinephases as well as quasicrystalline or amorphous alloys areof interest. Volume IV/5 therefore presents all these data.Because of the large amount available of experimentalevidence and thermochemical calculations, a presentation inone volume, as it was realized several decades ago in thewidely used book of M. Hansen "Aufbau derZweistoff-Legierungen" proved to be impossible. So volumeIV/5 had to be divided into several subvolumes which cover -in alphabetical order - all binary systems of importance.Subvolume IV/5c, the third of the series, deals with thesystems Ca-Cd ... Co-Zr. Further subvolumes will followshortly.