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Spatial Coverage
- North Rhine-Westphalia (Germany)7
- Netherlands6
- Belgium5
- Netherlands.4
- Rhineland-Palatinate (Germany)4
- Africa, Central3
- Africa, Eastern3
- Baden-Württemberg (Germany)3
- Cologne (Electorate)3
- Danube River3
- Danube River Watershed3
- Danube River Watershed.3
- Danube River.3
- Hesse (Germany)3
- Lower Saxony (Germany)3
- North Brabant (Netherlands)3
- North Holland (Netherlands)3
- Alsace (France)2
- America2
- Austria2
