Pedro Janssen’s scientific contributions

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Figure 1: Geography of the Netherlands; location of the 12 provinces. The grey colour indicates the higher, sandy soils and the marl soils in southern Limburg. Fr = Friesland, Gr = Groningen, Dr = Drenthe, Ov = Overijssel, Fl = Flevoland, Ge = Gelderland, Ut = Utrecht, NH = Noord-Holland, ZH = Zuid-Holland, Ze = Zeeland, NB = Noord-Brabant, Li = Limburg. 
Figuur 5: Monitoringstrend van de adder: 1993-2013. Op de verticale as staat de index-waarde. Deze is voor het startjaar van de monitoring op 100 gesteld. Bron NEM (RAVON/CBS). Figure 5: Monitoring trend of the adder: 1993-2013. The vertical axis shows the index value. For the first year of monitoring, this is set at 100. Source: NEM (RAVON/CBS). 
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The Adder (Vipera berus) in the Netherlands
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January 2015

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Pedro Janssen

Litteratura Serpentium 35(1): 29-54. Vipera berus in the Netherlands.

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