full textNot available 1authorsW. H. Sieben 1subjectsSoils -- Nitrogen content -- Netherlands -- Ijssel Lake Polders. [x]Crops and soils -- Netherlands -- Ijssel Lake Polders. 1 Loam soils. 1 Soils -- Netherlands -- Ijssel Lake Polders. 1 publication date1960-1979 1languagesDutch 1publishersStaatsdrukkerij 1 |