DIN 38402-20:1987-08 German standard methods for the examination of water, waste water and sludge; general information (group A); sampling of tidal waters (A 20)
1987DIN 38402-20:1987-08 German standard methods for the examination of water, waste water and sludge; general information (group A); sampling of tidal waters (A 20)
1987DIN 38402-20:1987 German standard methods for the examination of water, waste water and sludge; general information (group A); sampling of tidal waters (A 20)