The first map shows all known CAFOs, including small ones (SAFOs), and all known open feedlots.  The second map shows all CAFOs and open feedlots over 1000 animal units.  The third map includes CAFOs that need a manure management plan, which are those over 500 animal units (1250 hogs).  It also includes open feedlots that need a Nutrient Management Plan – which are those over 1000 animal units.