©
Piet Modderkolk: DUO-1
©
Piet Modderkolk: DUO-2
©
Piet Modderkolk: Gasunie-1
©
Piet Modderkolk: Gasunie-2
©
Piet Modderkolk: Groningen-1
©
Piet Modderkolk: Groningen-2