Källa: https://www.google.com/search?rlz=1C1GCEA_enSE823SE823&ei=Bq4ZXYOmMIzRmwXai5zYBQ&q=Velser+tunneln+Beverwijk&oq=Velser+tunneln+Beverwijk&gs_l=psy-ab.12...15326.23362..27038.. ...
Källa: https://www.google.com/search?rlz=1C1GCEA_enSE823SE823&ei=Bq4ZXYOmMIzRmwXai5zYBQ&q=Velser+tunneln+Beverwijk&oq=Velser+tunneln+Beverwijk&gs_l=psy-ab.12...15326.23362..27038...0.0..0.119.908.7j3......0....1..gws-wiz.......0i22i10i30j0i22i30j33i160j33i21j33i10i21j33i10.9CrOQHvqDqw, 2019-07-01 - ort.