Teken "Afsluitdijk" petitie!By KeesScherer / Activity › Forums › (Citizen) Science › Lichtvervuiling › Teken "Afsluitdijk" petitie! This topic has 10 replies, 4 voices, and was last updated 7 years, 6 months ago by Theunissen. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In