Catalogus Codicum Astrologorum Graecorum (CCAG) is a 12-volume (including appendices) catalogue of astrological writings in Greek. The CCAG edited, described, and excerpted from texts found in libraries throughout Europe, most edited and catalogued for the first time.[1] The CCAG was published between 1898 and 1953 in Brussels. The chief editors in the earlier period of publication were Franz Cumont and Franz Boll.[2] The CCAG was described as the "most important" modern survey of Greek astrological writings.[3]