www.stat.fi/meta/luokitukset/cpa/001-2008/37_en.html
... Community, 2008 version E WATER SUPPLY; SEWERAGE, WASTE MANAGEMENT AND REMEDIATION SERVICES 37 Sewerage services; sewage sludge 37.0 Sewerage services; sewage sludge 37.00 Sewerage services ...
04/14/2009