Keywords: Hydrogeological map - symbol - groundwater pumping station 1 (COLOR).svg Hydrogeological_map_-_symbol_-_groundwater_pumping_station_1_ COLOR UNESCO International Legend for hydrogeological maps Own 2007-11 Didiervberghe all Hydrogeological_map_-_symbol_-_groundwater_pumping_station_2_ COLOR svg Symbols for hydrogeological maps |