De adventieve flora bij de werkhaven van Hellevoetsluis
Gorteria Dutch Botanical Archives , Volume 3 - Issue 4 p. 49- 51
A list of species found near Hellevoetsluis, prov. S. Holland, on heaps of stones used for the Delta-works. The stones have been imported from the Westerwald and the Eifel in Germany (basalt), the Ardennes in Belgium (limestone), the valleys of Main and Meuse (gravel), and the southern part of the Netherlands province of Limburg (slacks from the mines).
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