Columbia subject headings:
Estuarine ecology--Ems River Estuary (Germany and Netherlands)
Tidal flat ecology--Ems River Estuary (Germany and Netherlands)
Harvard subject headings:
Estuarine ecology--Ems River Estuary (Germany and Netherlands)
Tidal flat ecology--Ems River Estuary (Germany and Netherlands)
Princeton subject headings:
Estuarine ecology--Germany--Ems River Estuary (Germany and Netherlands).
Tidal flat ecology--Germany--Ems River Estuary (Germany and Netherlands).