• Features Hydrological Rivers MajorRivers[r_name the_geom geom_id system ]
• Features Hydrological Rivers MajorRivers r_name[ | gid]
• Features Hydrological Rivers MajorRivers system[ | gid]
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SOURCES .Features .Hydrological .Rivers .MajorRivers r_name 1 index .system system