Version history for: CTD profiles and discrete water-column measurements collected off California and Oregon during NOAA cruise RL-19-05 (USGS field activity 2019-672-FA) from October to November 2019 (ver. 2.0, July 2022) ________________________________________________________ Version 1 posted online August 12, 2020. Original citation: Prouty, N.G., and Baker, M.C., 2020, CTD profiles and discrete water-column measurements collected off California and Oregon during NOAA cruise RL-19-05 (USGS field activity 2019-672-FA) from October to November 2019: U.S. Geological Survey data release, https://doi.org/10.5066/P9ZS1JX8. ________________________________________________________ Version 2 revised and reposted online July 13, 2022 Changes in version 2.0: An attribute column header in the water-column environmental variable data file (SH-19-05_BTL_CTD_data.csv) was revised to accurately report ammonium not ammonia. No data values were changed, nor were any changes made in the CTD data (SH-19-05_raw_CTD.zip). Metadata files for both data files were revised to reflect the new doi number, URLs, download links, and PIDs. Version 1 of the data release is still available online at the original doi link for reference purposes only. Version 2 citation: Prouty, N.G., and Baker, M.C., 2020, CTD profiles and discrete water-column measurements collected off California and Oregon during NOAA cruise RL-19-05 (USGS field activity 2019-672-FA) from October to November 2019 (ver. 2.0, July 2020): U.S. Geological Survey data release, https://doi.org/10.5066/P9JKYWQU.