• Features Hydrological Rivers MajorRivers[r_name the_geom geom_id system ]
• Features Hydrological Rivers MajorRivers system[ | gid]
• grid: /gid (unitless) ordered (0) to (97) by 1.0 N= 98 pts :grid
• null

SOURCES .Features .Hydrological .Rivers .MajorRivers system 1 index .system gid exch