Update 'Sand and gravel extraction' | Compendium Coast and Sea

Update 'Sand and gravel extraction'

The thematic chapter 'Sand and gravel extraction' has been updated taking into account the RD of 19 April 2014 and the recently published brochure 'Sand and Gravel extraction in the Belgian part of the North Sea' of the Continental Shelf Service of the FPD Economy, S.M.E.s, Self-emplyed and energy.