The "Cordoba Durchmusterung" (CD, Thome 1892-1932) is a visual survey of southern stars in the declination zones -22 to -89 deg, carried out as an extension to the "Bonner Durchmusterung" (BD) catalogs of Argelander (1859-1862) (see also Kuestner 1903) and Schoenfeld (1886). It contains 613959 records for stars brighter than 10.0 magnitude. Introduction: The goal of the survey was to obtain a position and estimated visual magnitude for every star down to 10.0 magnitude inclusive, but the faint limit was confirmed from comparisons with other catalogs, to be somewhat below 10. The positional uncertainties quoted in the original publications vary from +/- 0.42 sec and +/- 0.23 arcmin for zones -22 to -32 deg and +/- 0.33 sec, +/- 0.10 arcmin for zones -42 to -51 deg. The document originally prepared by Wayne H. Warren Jr., on which this document is closely based (adc.doc) contains substantial additional information.