The Fifth Edition of this National Aeronautics and Space Administration Goddard Space Flight Center Publication (RP-1294) is available. The updated CIO "is a database of over 325,000 published infrared observations of more than 55,000 individual astronomical sources over the wavelength range from 1 to 1000 microns." The catalog is available in both compressed and uncompressed formats, and file formats are explained at the site.