Middle Mesolithic occupation on the extensive site NP3 in the peat reclamation district of Groningen, the Netherlands - Groenendijk, Henry (Landscape-use during the final-palaeolithic and mesolithic in NW-Europe. The formation of extensive sites and site-complexes. Actes du 14ème Congrès UISPP, Université de Liège, Belgique, 2-8 septembre 2001. Section 7. Le mésolithique. C 7.1., 2004)