http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
per Terry Easterly at Texas AgriLife Extension Service "not published after the summer of 2009," 4/8/2011 tc.
Beginning with summer 2006 volume and numbering dropped.
Texas Agricultural Extension Service, Veterinary Medical Administration Bldg. 101, College Station, Texas 7783