Revision 2.0 by Andrew LaMotte on August 2, 2021. To review the changes that were made, see “Version_history.txt” in the attached files section.
Many of the original principal investigators behind this study are retired and or deceased. These data were originally recorded on paper files and either scanned or manually entered to generate electronic files. Data were archived on a U.S. Geological Survey (USGS) website (http://wwwpaztcn.wr.usgs.gov/vigil/) prior to October 1, 2016, but it has been discontinued. All images and PDFs were generated prior to July 21, 2001. Paper files are still in existence and are either housed by USGS or the National Archives. If you know of data that exists but were not included in this archive, please contact the USGS Water Resources Mission Area’s Observing Systems Division.