Regional and National Plans.
-Scientific Foundations
-Administrative Foundations
-Germany-General
-Rhine-Rhine Region

Netherlands see: Zuiderzee
-General
-Overijsel
-Utrecht
-North Brabant
-Limburg
-South Holland
-North Holland
-Amsterdam connections with the surrounding area

Abroad:
-China
-England
-France
-Nicaragua
-Scandinavia +Denmark
-USA
-USSR

Dewatering
Water+Soil pollution