Strandwallen ontstonden 1000den jaren geleden. Tussen de duinen en de jongste strandwal en tussen strandwallen ontstonden beekjes die het water afvoerden. Zij liggen op de laagste plekken tussen de strandwallen. Deze beekjes zijn later gekanaliseerd om het water af te voeren en ze bevaarbaar te maken. Deze kanalisatie moet in de Middeleeuwen hebben plaats gevonden….

Near the at-that-time hamlet Nung Udoh in Ibibio-land (now Akwa-Ibom State), south of Uyo,  South-East-Nigeria I observed in the period 1959-1964 celtic fields (in Dutch prehistoric raatakkers). I have described the origin of the Nung-Udoh raatakkers as they could have originated in the same way in prehistoric Netherlands. An important factor in Nigeria was and…

The spread of bread wheat in the Old World (Europe, Asia, Africa) since the Neolithicum as shown by the distribution of two necrosis genes and their alleles was studied. As basic material 1130 bread wheat landraces were investigated. Based on this distribution the routes by which bread wheat migrated are shown. The original spread was…

The history of the medieval vegetable gardens of the common man and woman: the poorness of descriptions and pictures In search of depictions of medieval vegetables, a study of medieval vegetable gardens of the common men and women was made. These gardens commonly occurred, but as they were probably too vulgar they were not described…