Amy Kimball . ... Radio Catalog . ... In this version, we have added low-frequency radio data from the VLA Low-frequency Sky Survey revised edition (VLSSr) and updated the optical data to SDSS DR9. In addition, the FIRST and NVSS data have been updated with newer versions of those surveys. Original version of the catalog published in Kimball Ivezi? (2008) , with some updates. This version was compiled from the FIRST, NVSS, WENSS, and GB6 radio surveys, with optical data from SDSS DR6. ...