http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Records of water-level measurements in Hays, Travis, and Williamson counties, Texas, 1937 to May 1956
compiled by C. R. Follett ; from records of the Texas Board of Water Engineers, and the Geological Survey, United States Department of the Interior.
Bulletin (Texas Board of Water Engineers) ; 5612